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Rectal thermometry

Rectal thermometry is a medical procedure for measuring core body temperature by inserting a lubricated thermometer probe into the rectum, typically 0.5 to 1 inch (1 to 2.5 cm) in depth for both children and adults.^[1]^[2] In specialized clinical settings, such as critical care, flexible thermistor probes may be inserted up to 6 inches (15 cm) for more precise core temperature assessment.^[3] This method is considered one of the most reliable indicators of internal body temperature, particularly in infants under 3 months of age and young children up to 3 years, where it is often recommended as the preferred site due to minimal influence from external factors.^[4]^[5] It has long been considered a reliable method for core temperature measurement, particularly in pediatrics, though its routine use has declined with the advent of less invasive alternatives like tympanic or temporal artery methods.^[6]^[7] Rectal thermometry offers high accuracy in reflecting true core temperature but is invasive, potentially causing discomfort, and is contraindicated in cases such as recent rectal surgery or diarrhea.^[8]^[9]

Definition and Overview

Definition

Rectal thermometry is a medical procedure that involves inserting a thermometer into the rectum through the anus to measure the internal body temperature, providing one of the most accurate assessments of core body temperature.^[4] This method is particularly valued in clinical settings for its reliability in reflecting central thermal status, especially in infants, young children, and situations where other routes may be less precise.^[10] Suitable thermometers for rectal use include digital electronic devices with flexible, short probes that utilize heat sensors for quick readings, as well as historical mercury-in-glass models that have largely been phased out due to safety concerns related to mercury toxicity.^[4]^[11] All rectal thermometers feature blunt tips to minimize the risk of injury during insertion.^[12] The rectum, the terminal portion of the large intestine, extends approximately 12 to 15 cm from the rectosigmoid junction to the anal canal, serving as a site where temperature equilibrates closely with core body heat due to its vascularity and relative insulation from external influences.^[13]

Physiological Basis

Core body temperature refers to the temperature of the deep tissues within the body, essential for optimal metabolic function, and is typically maintained within a narrow range of 36.5–37.5°C (97.7–99.5°F).^[14] This physiological parameter is primarily regulated by the hypothalamus, particularly its preoptic area, which functions as the body's central thermostat by integrating inputs from peripheral and central thermoreceptors to balance heat production and loss through mechanisms such as vasoconstriction, sweating, and shivering.^[14] The rectal site serves as an effective location for approximating core body temperature due to its anatomical proximity to major blood vessels, including the pelvic arteries branching from the abdominal aorta via the superior rectal artery, and internal organs within the pelvic cavity.^[15]^[3] When a probe is inserted to a sufficient depth—for precise adult measurements up to 15 cm from the anal sphincter, or 1-2.5 cm for infants and young children—it positions near these vascular structures and larger organ masses, allowing the measurement to reflect the thermal equilibrium of deep tissues with minimal interference from superficial or environmental factors like ambient air temperature.^[3]^[1] The rectum's relatively low blood perfusion and high thermal inertia further contribute to this stability, as heat exchange is primarily conductive rather than convective, resulting in consistent readings that closely align with internal body conditions under normothermic states.^[15] However, rectal temperature measurements exhibit a notable time lag in response to dynamic physiological changes, typically requiring 3 minutes for glass thermometers or 10-60 seconds until stable for digital devices to equilibrate with surrounding tissues after insertion.^[4] This delay, which can extend to 6-60 minutes for broader temperature shifts due to the site's thermal inertia, ensures reliability for establishing baseline core temperature but renders it slower to detect rapid alterations, such as those occurring in acute fevers or exertional hyperthermia.^[15]^[16]

Clinical Applications

Indications

Rectal thermometry is primarily indicated for accurate fever detection in infants under 3 months of age, as this method provides the most reliable core body temperature measurement in this vulnerable population.^[11] The American Academy of Pediatrics endorses rectal temperature measurement for newborns and young children up to 3 years old, citing the unreliability of alternative methods such as axillary or temporal artery thermometry, which can underestimate true core temperature and lead to missed diagnoses of fever.^[17] In neonatal intensive care units, rectal probes are commonly employed for continuous core temperature monitoring, particularly in preterm infants and those requiring therapeutic hypothermia, where precise tracking of temperature fluctuations is essential for managing conditions like hypoxic-ischemic encephalopathy.^[18] Beyond pediatrics, rectal thermometry is preferred in clinical scenarios demanding high-precision core temperature assessment, such as perioperative hypothermia monitoring during surgery, especially in pediatric patients at elevated risk due to anesthesia-induced thermoregulatory impairment.^[19] It is also indicated for sepsis evaluation in neonates and young children, where accurate core temperature readings help identify early signs of infection, as peripheral methods may not reflect true systemic involvement.^[20] Additionally, rectal measurement is suitable for uncooperative or comatose patients, including those experiencing seizures, when oral or axillary approaches are impractical or unreliable due to patient agitation or altered mental status.^[21]

Contraindications

Rectal thermometry is contraindicated in several medical conditions to avoid potential harm, including infection, bleeding, or procedural complications. Absolute contraindications include recent rectal surgery or trauma, where insertion of the thermometer could disrupt healing tissues or cause further injury.^[5] Active gastrointestinal bleeding is also an absolute contraindication due to the risk of exacerbating hemorrhage or introducing infection at the site.^[22] Neutropenia represents a critical absolute contraindication, as the procedure may breach the anal mucosa and lead to bacteremia or systemic infection in immunocompromised patients with low neutrophil counts.^[23] Similarly, known anal fissures, stenosis, rectal inflammation, infection, or hemorrhoids are absolute contraindications, as they increase the risk of pain, bleeding, or spreading infection.^[24] Relative contraindications encompass situations where the procedure may be feasible but carries elevated risks or reduced reliability, warranting alternative methods. Diarrhea is a relative contraindication because fecal matter can interfere with accurate thermometer placement and reading, potentially leading to unreliable temperature measurements or mucosal irritation.^[22] Broader immunocompromised states, beyond neutropenia, such as in oncology patients, are relative contraindications due to heightened infection susceptibility, though medical staff approval may allow use in select cases.^[25] Patient refusal or significant discomfort, particularly in adults, serves as a relative contraindication, as the procedure should respect autonomy and minimize distress when non-invasive options are available.^[9] Even with proper technique, rare complications such as rectal perforation can occur, with an incidence estimated as very low (less than 0.01% in modern practice), primarily reported in neonates using rigid thermometers but underscoring the need for trained personnel in high-risk cases to mitigate such events.^[26]

Procedure and Techniques

Equipment

Rectal thermometry requires specialized equipment to ensure accuracy, safety, and hygiene during measurement. The primary tool is a digital rectal thermometer, which uses electronic heat sensors to provide rapid readings, typically within 10 to 30 seconds.^[4]^[27] These thermometers feature a flexible tip for patient comfort and a wide base or stopper to prevent over-insertion, reducing the risk of injury.^[28] Many models include an audible alarm or beep to signal reading completion, along with a digital display for clear results in Celsius or Fahrenheit.^[11]^[29] In clinical settings, single-use disposable probes are often employed to minimize cross-infection risks, particularly in hospitals where infection control is paramount.^[30] These probes are compatible with electronic thermometer bases and are discarded after one use.^[31] For reusable thermometers, disposable probe covers made of plastic sheaths are essential to maintain sterility and prevent contamination between patients.^[4]^[27] A lubricant, such as petroleum jelly or water-based KY jelly, is applied to the thermometer tip or probe to facilitate smooth insertion and reduce discomfort.^[27]^[32]^[11] Additional supplies include disposable gloves to protect both the practitioner and patient from exposure, and antiseptic wipes or alcohol-based solutions for cleaning reusable components post-use.^[4]^[32] Proper waste disposal containers are also necessary for discarding used probe covers, lubricants, and single-use items to uphold hygiene standards.^[33] Thermometers designated for rectal use should be labeled separately from those for oral or axillary measurements to avoid cross-contamination.^[4]

Preparation

Before performing rectal thermometry, explain the procedure to the patient or their guardian to obtain informed consent and reduce anxiety, ensuring privacy by closing doors or using screens during the process.^[27] Don disposable gloves to maintain hygiene and prevent infection transmission. Position the patient appropriately: place infants supine on their back with legs lifted toward the chest, while older children and adults should lie on their left side with knees drawn up (Sims' position) for easier access to the anus.^[34]^[35] Prior to starting, confirm there are no contraindications such as neutropenia, recent rectal surgery, or coagulopathy.^[25]

Insertion

Select a clean, lubricated thermometer designated for rectal use, applying a lubricant (such as petroleum jelly) to the tip and surrounding anal area to minimize discomfort and tissue trauma.^[27] Gently separate the buttocks and insert the thermometer tip into the anus: 1.3 to 2.5 cm (0.5 to 1 inch) for infants and neonates, not exceeding the length of the bulb to avoid injury; use a shorter probe (about 1 cm insertion) for preterm neonates.^[34]^[25] For adults and older children, insert 3.5 to 5 cm (1.5 inches to 2 inches) at a 20-degree angle toward the umbilicus, holding the thermometer firmly in place with your fingers to prevent expulsion.^[12]^[36] Maintain the position until the digital thermometer beeps (typically 10-30 seconds) or for 2-3 minutes with a glass thermometer to ensure accurate equilibration.^[27] Monitor the patient for signs of distress throughout, stopping immediately if resistance is encountered or discomfort is reported.^[37]

Removal and Reading

Gently withdraw the thermometer while supporting the patient, avoiding sudden movements to prevent irritation. Read the temperature promptly; normal rectal values range from 36.6°C to 38°C (97.9°F to 100.4°F).^[38] Discard any disposable sheath, then clean and disinfect the thermometer with soap and water or 70% isopropyl alcohol according to manufacturer guidelines before storage. Record the temperature, time, and any observations (e.g., patient tolerance) in the medical chart.^[27] Wash hands thoroughly after the procedure.^[39]

Special Considerations

For neonates and preterm infants, use smaller, flexible probes to reduce perforation risk, and limit insertion to 1-2 cm while closely observing for bradycardia or agitation.^[25] In all cases, never force the thermometer and supervise closely to ensure safety, particularly in young or uncooperative patients.^[37]

Accuracy and Comparisons

Measurement Accuracy

Rectal thermometry is considered a reliable proxy for core body temperature, typically yielding measurements within 0.1°C of pulmonary artery temperature, the established gold standard, with a mean bias of -0.07°C and standard deviation of 0.40°C in postoperative cardiac surgery patients.^[40] In controlled clinical environments, variability remains below 0.5°C, supporting its use as an accurate invasive method for assessing true core temperature.^[41] Precision in rectal temperature readings depends on several procedural and physiological factors. Adequate insertion depth, recommended at 10-15 cm to position the probe near major pelvic arteries, minimizes bias compared to shallower placements, which can underestimate core temperature by up to 0.2°C during physiological stress like exercise or cooling.^[3] Equilibration time is critical, with glass thermometers requiring a minimum of 3 minutes to stabilize and achieve thermal equilibrium with surrounding tissues, while digital devices often signal completion in under 1 minute but benefit from similar dwell times for optimal accuracy.^[12] However, rectal thermometry exhibits a slower response time to rapid changes in core temperature compared to more central methods like esophageal or pulmonary artery, potentially lagging by 0.5–1°C during conditions such as cold-water immersion or therapeutic hypothermia.^[3] Validation studies demonstrate strong reliability of rectal thermometry. Studies report 95% limits of agreement typically within ±0.5°C between rectal and esophageal temperatures, confirming its consistency across normothermic and febrile states.^[40] In pediatric populations, rectal measurements exhibit higher reliability than non-invasive alternatives like tympanic or axillary methods and serve as a reference standard for fever detection.^[42]

Comparisons to Other Methods

Rectal thermometry provides temperature readings that are typically 0.3–0.5°C higher than those obtained via the oral route, reflecting its closer approximation to core body temperature.^[12] Oral measurements, however, tend to be less accurate in mouth breathers, as airflow can cool the sublingual area and lower the recorded value, and in young children who may struggle to keep their mouths closed during the procedure.^[38] Compared to axillary thermometry, rectal temperatures are generally 0.5–1°C higher, with axillary readings often underestimating core temperature by up to 1°C due to the site's exposure to ambient air and lower vascularity.^[43] This discrepancy makes axillary measurements particularly unsuitable for infants, where differences can exceed 0.7°C on average and lead to missed detections of fever.^[44] In neonates, rectal thermometry offers greater consistency than tympanic or temporal artery methods, which can vary by up to 0.6°C depending on factors such as ear canal debris, improper probe angle, or operator technique.^[45] Tympanic readings, for instance, may underestimate rectal temperatures by a mean of 0.6°C in children under 6 years, while temporal scans are similarly prone to inconsistencies from probe placement errors.^[45] Rectal thermometry serves as a reliable, less invasive proxy for central temperature measurements like esophageal or pulmonary artery methods, which provide the most direct core assessments but are reserved for critical care scenarios due to their procedural risks and complexity.^[46] It is preferred in routine settings where such invasive techniques are impractical.^[47]

Advantages and Limitations

Advantages

Rectal thermometry is widely regarded as a highly accurate method for measuring core body temperature, serving as the gold standard in clinical settings, especially for infants and neonates where alternative methods like axillary or tympanic measurements often yield less reliable results due to anatomical and physiological factors.^[48]^[49] This precision is critical in vulnerable populations, such as young children under three years old, where accurate fever detection can guide timely interventions for conditions like sepsis.^[50] The method's ability to reflect deep tissue temperature closely aligns with true core readings, minimizing discrepancies that can occur with peripheral sites influenced by vasoconstriction or poor perfusion in neonates.^[51] As of 2025, clinical guidelines continue to recommend rectal thermometry as the gold standard for accurate fever assessment in infants under 3 months.^[52] In non-ambulatory or sedated patients, rectal thermometry demonstrates superior reliability, delivering consistent measurements unaffected by external variables such as sweating, clothing, or ambient environmental conditions that can distort surface-based techniques.^[53] This independence from patient movement or cooperation makes it particularly suitable for perioperative or intensive care scenarios, where maintaining thermal monitoring without disturbance is essential.^[54] Furthermore, contemporary digital rectal thermometers enhance practicality through cost-effectiveness, featuring reusable designs with minimal per-use expenses after initial investment, alongside rapid readout times typically under 30 seconds for efficient clinical workflows.^[55]^[5] These attributes contribute to their favorable adoption in resource-limited settings, balancing accuracy with operational efficiency.^[56]

Limitations and Risks

Rectal thermometry is an invasive procedure that often causes significant discomfort, particularly in pediatric patients, where it can lead to anxiety, resistance, and behavioral challenges during measurement.^[10] The insertion of the thermometer probe can be distressing for young children and uncooperative individuals, exacerbating emotional responses and potentially complicating the process in clinical settings.^[57] Additionally, the method requires holding the thermometer in place until a stable reading, typically 10-60 seconds for digital devices, which is slower than non-invasive alternatives like tympanic or temporal artery measurements (1-5 seconds).^[58]^[12] Infection transmission poses a notable risk if proper hygiene protocols are not followed, such as using disposable probe covers or single-use thermometers, which can lead to cross-contamination between patients.^[10] In immunocompromised individuals, such as those undergoing cancer treatment, rectal manipulation increases the potential for bacterial spread or serious infections, and is generally avoided to minimize complications.^[59] Rare but serious adverse events include mucosal trauma, such as rectal perforation; with digital devices, risks are exceedingly rare, with no reported cases in recent literature, though estimates for glass thermometers were fewer than one in 2 million procedures, particularly in neonates or fragile patients.^[57]^[9]^[60] Practical limitations further restrict the applicability of rectal thermometry, as it demands a private environment to maintain patient dignity, rendering it less suitable for busy outpatient or prehospital settings.^[57] For patients with mobility issues, such as the bedbound or elderly with limited flexibility, positioning for accurate probe insertion can be challenging and may require additional assistance, increasing procedural complexity.^[61] Overall, these factors contribute to its declining use in favor of less intrusive methods where feasible.

Historical Development

Early History

The recognition of elevated body temperature, or fever, as a key indicator of illness dates back to ancient medicine. As early as 400 BC, Hippocrates described using the hand to assess the heat of the body for diagnosing fevers, laying the groundwork for temperature as a clinical vital sign, though no instrumental measurement existed at the time. While rectal examinations for diagnostic purposes appear in early medical texts, such as probes mentioned in some ancient practices, medical records indicate that rectal thermometry was practiced as early as the 18th century, considered safer for infants than oral insertion. Precise thermometry was not feasible until the development of scaled instruments in the 16th century. Early thermoscopes, like those invented by Galileo Galilei around 1593, relied on air or liquid expansion but lacked fixed scales and were primarily used for environmental observations rather than clinical rectal applications.^[62] Significant advancements in the 19th century made rectal thermometry practical. Prior to this, medical thermometers were cumbersome, often 12 inches long and requiring up to 20 minutes to register a reading, rendering them unsuitable for rectal insertion due to discomfort and risk. In 1867, English physician Sir Thomas Clifford Allbutt introduced the short clinical thermometer, measuring just 6 inches in length and filled with mercury for greater precision and faster response—typically under 5 minutes. This innovation dramatically improved portability and usability, enabling safer and more routine rectal measurements by allowing insertion without excessive depth or wait time.^[63] Allbutt's design marked a pivotal shift, transforming thermometry from a laboratory tool into a bedside essential. The adoption of rectal thermometry accelerated in the late 19th century, particularly influenced by foundational studies on body temperature. In 1868, German clinician Carl Reinhold August Wunderlich published Das Verhalten der Eigenwärme in Krankheiten, analyzing over 100,000 axillary and oral measurements to establish the normal human body temperature at 37°C (98.6°F), emphasizing its constancy in health and variability in disease. Although Wunderlich critiqued rectal methods for potential inaccuracies from fecal interference and favored non-invasive sites, his work standardized temperature as a diagnostic metric and indirectly promoted rectal use where precision was paramount, such as in vulnerable populations. Following Allbutt's innovation, thermometry integrated into routine clinical practice in the late 19th and early 20th centuries. Rectal measurement, offering a closer approximation to core body heat, became particularly recommended in pediatrics during the mid-20th century, especially for infants and young children where oral or axillary methods proved less accurate or feasible. This period saw thermometry integrate into routine clinical practice, with rectal routes preferred for their closer approximation to internal body heat.^[64]^[63]

Modern Advancements

In the mid-20th century, particularly during the 1950s, rectal thermometry solidified its position as the gold standard for accurate core body temperature measurement in hospital environments, especially for vulnerable populations such as pediatric patients where precise assessment was critical.^[63] This method's reliability stemmed from its ability to reflect central temperature closely, surpassing less invasive alternatives available at the time. By the 1970s, a significant technological shift occurred with the introduction of electronic digital thermometers for rectal use, which provided faster readings—typically within seconds—compared to the several minutes required by traditional glass-mercury models, enhancing efficiency in clinical settings.^[65] Entering the late 20th and early 21st centuries, advancements included the development of disposable rectal probes and automated monitoring systems, particularly in intensive care units (ICUs), where single-use sensors reduced infection risks and enabled seamless integration with vital sign monitors for intermittent or continuous tracking.^[66] Concurrently, the American Academy of Pediatrics (AAP) updated its guidelines in the 2010s, reaffirming rectal thermometry as a preferred method for neonates and young infants to define fever (rectal temperature ≥38.0°C or 100.4°F), even as tympanic infrared alternatives gained popularity for their non-invasiveness, though with noted variability in accuracy.^[67] Post-2000 trends emphasized enhanced integration of rectal probes with telemetry systems for real-time, wireless continuous monitoring in critical care, allowing remote data transmission to central stations and improving response times during procedures like targeted temperature management.^[68] The phase-out of mercury-based rectal thermometers accelerated due to environmental and health toxicity concerns, with the U.S. Environmental Protection Agency (EPA) issuing a 2008 memorandum to eliminate mercury devices in federal labs and many states enacting sales bans by the early 2000s, prompting widespread adoption of safer digital alternatives.^[69] Recent studies have continued to validate rectal thermometry as the reference standard, showing superior accuracy compared to infrared methods like tympanic scanners in pediatric and adult cohorts, with tympanic sensitivity around 92% against rectal readings.^[42]

References

[1]
How to Take a Rectal Temperature | Nemours KidsHealth
Insert the lubricated thermometer into the anal opening about ½ inch to 1 inch (about 1.25 to 2.5 centimeters), or until the tip of the thermometer is fully in ...
[2]
How to take a rectal temperature - NewYork-Presbyterian
Gently insert the bulb end of the rectal thermometer about 0.6 in. (1.5 cm) to 1 in. (2.5 cm) into the anal canal. Don't force it into the rectum. Hold ...
[3]
Validity of Core Temperature Measurements at 3 Rectal Depths ...
Clinicians should insert flexible thermistors 15 cm (6 in) into the rectum for the most valid estimate of Tcore. If clinicians do not have access to flexible ...
[4]
Thermometers: Understand the options - Mayo Clinic
Rectal temperatures provide the most-accurate readings for infants, especially those 3 months or younger, as well as children up to age 3. Temperatures taken ...
[5]
[PDF] Clinical Practice Guideline: Non-invasive Temperature Measurement
Specifically, only rectal temperature measurements are recommended in children 3 months and younger, unless contraindicated (Jean-Mary et al., 2002).
[6]
Thermometer use 101 | AAP News | American Academy of Pediatrics
Nov 1, 2009 · Taking a rectal temperature: · Clean the end of the thermometer with rubbing alcohol or soap and water; rinse in lukewarm water and dry. · Place ...
[7]
Nursing guidelines : Temperature management
Procedure: Place plastic sheath over thermometer. Dab a small amount of lubricant on end of thermometer. Carefully insert thermometer 2cm into the infant's anus ...
[8]
Discharge Instructions: Taking a Rectal Temperature (Child)
Gently slip the tip of the thermometer into the opening where bowel movements leave the child's body (the rectum) no farther than ½ inch to 1 inch. Hold the ...<|control11|><|separator|>
[9]
Optimization of the Recommended Time for Rectal Temperature ...
Rectal temperature has been widely viewed as the gold standard for routine measurement of core body temperature in children. This site is not influenced by ...
[10]
Temperature Measurement for Patients with Fever - U.S. Pharmacist
Mar 20, 2008 · Each site has its own advantages and disadvantages. Rectal temperatures have long been thought to be the closest estimator of core temperature.
[11]
Comparison of Rectal and Aural Core Body Temperature ...
An accurate Tcore assessment may help to rule in EHS, over other emergency medical considerations, such as hyponatremia, cardiac emergency, diabetic emergency, ...
[12]
Rectal Temperature - an overview | ScienceDirect Topics
Rectal temperature refers to the body temperature measured by inserting a temperature catheter into the anus, which provides a better accuracy than other ...
[13]
Advantages & Disadvantages Of Different Types Of Thermometers
Digital thermometers are the most accurate and quickest form of thermometer. The readings are obtained from the underside of the tongue, the rectum, or the ...Digital Thermometers · Glass And Mercury... · Axillary Measurement (armpit...
[14]
Types of Thermometers, Their Accuracy, and How to Use Them
Dec 15, 2020 · Drawbacks · Oral readings won't be accurate if they are taken too close to eating or drinking, because results may be skewed by your food or ...
[15]
Temperature management : rectal temperature (PCCU) | NHSGGC
May 9, 2025 · This nursing procedural guideline is intended as a resource for nursing staff involved in caring for children in the Paediatric Critical Care Unit that require ...
[16]
[PDF] Validation of Electronic Rectal Thermometry
In all patients the thermometers were inserted 3 cm into the rectum over approximately ten seconds.Missing: procedure guidelines
[17]
Thermometry in children - PMC - NIH
Rectal thermometry. Rectal temperature measurement is supposed to be the closest to core temperature among the measurements done at various peripheral sites ...
[18]
How to Take Your Child's Temperature - HealthyChildren.org
Apr 17, 2024 · It is best to use a digital thermometer to check your child's temperature. Do NOT use a mercury thermometer. These thin glass devices filled ...
[19]
Temperature - Clinical Methods - NCBI Bookshelf - NIH
Rectal temperature is measured with a lubricated blunt-tipped glass thermometer inserted 4 to 5 cm into the anal canal at an angle 20° from the horizontal with ...
[20]
Anatomy, Abdomen and Pelvis, Rectum - StatPearls - NCBI Bookshelf
[1] The rectum measures between 12 to 15 cm in length from the rectosigmoid junction to the dentate line in the anal canal.
[21]
Physiology, Temperature Regulation - StatPearls - NCBI Bookshelf
Jul 30, 2023 · Thermoregulation is the maintenance of physiologic core body temperature by balancing heat generation with heat loss.
[22]
Rectal Temperature - an overview | ScienceDirect Topics
Rectal temperature, which under ordinary conditions gives the highest readings, undoubtedly gives the truest indications of the internal body temperature.<|control11|><|separator|>
[23]
Core Temperature Measurement—Principles of Correct ... - MDPI
Oct 10, 2021 · Summary of temperature measurements. Measurement location, Accuracy, Special Requirements, Advantages, Disadvantages. Body surface, Poor, None ...<|separator|>
[24]
Thermometers 101: How to check temperature during COVID-19 ...
Nov 1, 2020 · Rectal thermometers give the best reading for infants under 3 months of age. Insert the rectal thermometers into the anal opening. For ...
[25]
Temperature Monitoring Devices in Neonates - PMC - PubMed Central
Aug 24, 2021 · Indwelling rectal probes are commonly used for the continuous measurement of core temperature in neonates undergoing therapeutic hypothermia for ...
[26]
[PDF] Thermoregulation Guidelines for the Care of the Pediatric Patient
For all patients 2 years and younger and those at high risk for hypothermia, as determined by the anesthesiologist, monitor temperature via rectal probe, ...
[27]
Accuracy of the Axillary Temperature Screening Compared to Core ...
Jun 20, 2022 · Accurate temperature measurement is important especially in infants where higher likelihood of sepsis and hospital admission is a concern.
[28]
Rectal Thermometer - an overview | ScienceDirect Topics
It is recommended that flexible rectal thermometers should be placed 8–15 cm from the anal sphincter. It has to be taken into account that under certain ...Missing: equilibrate | Show results with:equilibrate<|control11|><|separator|>
[29]
Assessing Body Temperature - RNpedia
Rectal temperatures are contraindicated for patients with diarrhea, immunosupressed, with rectal disease, have a clotting disorder, haemorrhoids and who are ...
[30]
The Risk of Rectal Temperature Measurement in Neutropenia - PMC
Avoiding rectal thermometry is recommended in patients with neutropenic fever. Permeability of the anal mucosa may result in a higher risk of bacteremia in ...
[31]
What are the (6) contraindications to taking a rectal temperature?
Rectal inflammation or infection, as measuring rectal temperature can be painful and can spread the infection further; Certain conditions such as hemorrhoids, ...
[32]
[PDF] Clinical Update | ClearTriage
Mar 1, 2018 · Exception: Rectal temps are contraindicated in children with certain high-risk conditions (e.g., bleeding disorders, neutropenia, NEC). ...
[33]
The 7 Best Baby Thermometers To Get Quick And Accurate Readings
Jul 7, 2025 · My top pick is the Frida Baby Quick-Read Rectal Thermometer. It has a flexible tip and a wide base to prevent you from inserting the thermometer too far.
[34]
Temperature measurement: MedlinePlus Medical Encyclopedia
### Summary of Rectal Thermometer Use and Equipment
[35]
Single Use Thermometers in Infection Control
Jun 13, 2023 · Single-use, disposable thermometers provide the best combination of accuracy and infection control. Non-contact thermometers have implied infection control ...
[36]
Mon-a-therm™ General Purpose Temperature Probe 400TM
The probe quickly and accurately reflects changes in core body temperature. The probe offers single-patient use convenience and infection control. The probe is ...Mon-A-Thermtm General... · Description · Probes For Esophageal...
[37]
How to Use a Rectal Thermometer - Verywell Health
Apr 11, 2025 · A rectal thermometer measures the body's internal temperature after you insert it into the anus (the opening where bowel movements come out).
[38]
Disinfection of Healthcare Equipment | Infection Control - CDC
Nov 28, 2023 · Other probes such as rectal, cryosurgical, and transesophageal probes or devices also should be high-level disinfected between patients.Endoscopes, Laparoscopes... · Flexible Gi Endoscope... · Cryptosporidium...
[39]
Thermometer basics: Taking your child's temperature - Mayo Clinic
Digital thermometers. These thermometers use electronic heat sensors to record body temperature. They can be used in the rectum (rectal), mouth (oral) or armpit ...
[40]
https://pubmed.ncbi.nlm.nih.gov/12577157/
[41]
Vital Signs – Temperature | College of Nursing | ECU
Gently insert thermometer into anus in direction of umbilicus 3.5 cm (1.5 inches) for adults. Do not force thermometer. Once positioned, hold thermometer probe ...
[42]
Measuring a Baby's Temperature | Johns Hopkins Medicine
Use a digital thermometer to check your child's temperature. Don't use a mercury thermometer. There are different kinds and uses of digital thermometers.
[43]
Temperature measurement in paediatrics - PMC - NIH
TABLE 1: ; Rectal, 36.6°C to 38°C (97.9°F to 100.4°F) ; Ear, 35.8°C to 38°C (96.4°F to 100.4°F) ; Oral, 35.5°C to 37.5°C (95.9°F to 99.5°F) ; Axillary, 34.7°C to ...
[44]
How to take your temperature - Mayo Clinic
Apr 7, 2020 · Don't use the same thermometer for both oral and rectal temperatures. Get two and label which is used where. Wait at least 6 hours after ...
[45]
comparison of urinary bladder, oesophageal, rectal, axillary, and ...
The mean differences between pulmonary artery temperatures and those of the different methods studied were: oesophageal (0.11+/-0.30 degrees C), rectal (-0.07 ...Missing: accuracy | Show results with:accuracy
[46]
Comparison of temporal artery, rectal and esophageal core ...
Several adult and paediatric studies have demonstrated closer agreement between the core temperature taken in the pulmonary artery and rectal temperature than ...
[47]
Core Temperature and Percentage of Dehydration in Professional ...
Maximal T c was not associated with percentage of dehydration or sweat rate. Linemen were less dehydrated but demonstrated higher T c than backs during ...
[48]
Diagnostic test accuracy of new generation tympanic thermometry in ...
May 12, 2020 · Among these methods, rectal thermometry has been the most reliable for measuring body temperature in children and is considered clinically to be ...
[49]
Axillary and rectal temperature measurements in infants - PMC - NIH
The normal temperature range derived from the babies at home was 36.7-37.9 degrees C for rectal temperature and 35.6-37.2 degrees C for axillary temperature.Missing: procedure | Show results with:procedure
[50]
Axillary and rectal temperature measurements in infants - PubMed
Rectal temperature was higher than axillary in 98% of the measurements. The mean (SD) difference between rectal and axillary temperatures was 0.7 (0.5) degrees ...
[51]
Accuracy of tympanic temperature readings in children under 6 ...
The mean difference between rectal and tympanic temperatures was -0.60 degrees C. Threshold-adjusted accuracy in screening for fever was determined by ...Missing: neonates | Show results with:neonates
[52]
A comparison of tympanic and rectal temperatures in term ...
Jun 25, 2012 · The mean rectal temperature (37.34 ± 0.55°C) was significantly higher than the mean tympanic temperature (37.25 ± 0.56°C) (p < 0.001) with a ...
[53]
A Core Body Temperature Retrieval Method for Microwave ...
The goal is for microwave radiometry to serve as a noninvasive alternative to the highly invasive measurement methods (i.e., esophageal and pulmonary artery ...
[54]
Noninvasive Monitoring during Interhospital Transport of Newborn ...
Esophageal temperature monitoring has been reported to be more accurate compared to measurements obtained from tympanic, rectal, axillary, or the bladder [70].
[55]
[PDF] A Comparison of the Use of Tympanic, Axillary, and Rectal ...
Rectal temperatures may not reflect these sorts of changes; therefore rectal temperature may not accurately reflect infant's core temperatures. Ototemp ...
[56]
Infrared Thermometers A Good Alternative For Use On Newborns
Feb 23, 1999 · “Rectal temperatures have been the gold standard in measuring a newborn's temperature,” said John Seguin, associate professor of pediatrics ...Missing: core | Show results with:core
[57]
Axillary thermometry is the best choice for newborns - The Hospitalist
Aug 24, 2017 · The American Academy of Pediatrics recommends rectal thermometers as the gold standard for children under 3 years old, but axillary ...
[58]
[PDF] Office of Evidence Based Practice (EBP) – Critically Appraised Topic
The gold standard for measuring body temperature is core body temperature ... Fourteen temperature samples compared electronic rectal thermometers to core.
[59]
[PDF] Thermometry in children
practice.[6] Advantage with rectal temperature is that it is not affected by environmental temperature ... Estimating core temperature in infants and children ...
[60]
Temperature Monitoring and Perioperative Thermoregulation - PMC
Core temperature monitoring is appropriate during most general anesthetics both to facilitate detection of malignant hyperthermia and to quantify hyperthermia ...
[61]
Evaluation of clinical thermometers for accuracy and reliability
Aug 6, 2025 · The purpose of this study was to examine the accuracy and reliability of a wide range of clinical thermometry instruments and technologies.
[62]
Thermometry in paediatric practice - PMC - PubMed Central - NIH
Recent studies have shown that tympanic temperature accurately reflects pulmonary artery temperature, even when body temperature is changing rapidly.
[63]
Gastrointestinal Complications (PDQ®)–Health Professional Version
Apr 3, 2025 · In immunocompromised patients, manipulation of the rectum and anus should be avoided (i.e., no rectal examinations, no suppositories, and no ...<|control11|><|separator|>
[64]
Using Low-Tech Thermometers to Measure Body Temperatures in ...
May 5, 2021 · ... rectal temperature readings. This site could be implemented as a ... Additionally, older adults with limited mobility and flexibility ...
[65]
History of the Thermometer - PMC - NIH
Aug 23, 2019 · The earliest thermal instruments were developed during the sixteenth and seventeenth centuries. In 1665, it was suggested that the melting point of ice and the ...
[66]
A six-foot long thermometer? The surprising history of a vital medical ...
Apr 8, 2020 · A mere six inches long, Allbutt's thermometer was able to discern a steady body temperature in under five minutes, as opposed to the 20 minutes of competing, ...Missing: 1867 | Show results with:1867
[67]
What is a fever? Beginning of thermometry | AAP News
Mar 4, 2019 · Carl Wunderlich published a treatise in 1868 that ... Wunderlich utilized axillary and oral measurements but not rectal temperatures.Missing: Carlo | Show results with:Carlo
[68]
A comparison of 2 methods of measuring rectal temperature with ...
Digital rectal thermometers typically have 2 distinct modes of operation: dwell or monitor, in which body temperature is displayed continuously, ...<|separator|>
[69]
Level 1™ Esophageal/Rectal Temperature Probes - ICU Medical
The sensors are designed for insertion into the esophagus, nasopharynx, or rectum. Temperature probes provide feedback on the core patient temperature that ...Missing: hospital | Show results with:hospital
[70]
Evaluation and Management of Well-Appearing Febrile Infants 8 to ...
For eligibility, this guideline addresses febrile infants who (1) are well appearing, (2) have documented rectal temperatures of ≥38.0°C or 100.4°F at home in ...KASs: Well-Appearing 8- to 21... · KAS 7a · KAS 12d · KAS 14c: Clinicians Should...
[71]
Comparison of a Continuous Noninvasive Temperature to Monitor ...
Jul 6, 2020 · During TTM, multiple sites are utilized for continuous core temperature monitoring, including bladder, esophageal, and rectal probes. The ...
[72]
Phasing Out Mercury Thermometers Used in Industrial and ...
Since initiating the program, EPA labs removed and safely disposed of approximately 2,000 mercury-containing non-fever thermometers.