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the degree of sensible heat or cold, expressed in terms of a specific scale. See Table of Temperature Equivalents in the Appendices. Body temperature is measured by a clinical thermometer and represents a balance between the heat produced by the body and the heat it loses. Though heat production and heat loss vary with circumstances, the body regulates them, keeping a remarkably constant temperature. An abnormal rise in body temperature is called fever.

Normal Body Temperature. Body temperature is usually measured by a thermometer placed in the mouth, the rectum, or the auditory canal (for tympanic membrane temperature). The normal oral temperature is 37° Celsius (98.6° Fahrenheit); rectally, it is 37.3° Celsius (99.2° Fahrenheit). The tympanic membrane temperature is a direct reflection of the body's core temperature. These values are based on a statistical average. Normal temperature varies somewhat from person to person and at different times in each person. It is usually slightly higher in the evening than in the morning and is also somewhat higher during and immediately after eating, exercise, or emotional excitement. Temperature in infants and young children tends to vary somewhat more than in adults.
Temperature Regulation. To maintain a constant temperature, the body must be able to respond to changes in the temperature of its surroundings. When the outside temperature drops, nerve endings near the skin surface sense the change and communicate it to the hypothalamus. Certain cells of the hypothalamus then signal for an increase in the body's heat production. This heat is conducted to the blood and distributed throughout the body. At the same time, the body acts to conserve its heat. The arterioles constrict so that less blood will flow near the body's surface. The skin becomes pale and cold. Sometimes it takes on a bluish color, the result of a color change in the blood, which occurs when the blood, flowing slowly, gives off more of its oxygen than usual. Another signal from the brain stimulates muscular activity, which releases heat. Shivering is a form of this activity—a muscular reflex that produces heat.

When the outside temperature goes up, the body's cooling system is ordered into action. Sweat is released from sweat glands beneath the skin, and as it evaporates, the skin is cooled. Heat is also eliminated by the evaporation of moisture in the lungs. This process is accelerated by panting.

An important regulator of body heat is the peripheral capillary system. The vessels of this system form a network just under the skin. When these vessels dilate, they allow more warm blood from the interior of the body to flow through them, where it is cooled by the surrounding air.
Abnormal Body Temperature. Abnormal temperatures occur when the body's temperature-regulating system is upset by disease or other physical disturbances. fever usually accompanies infection and other disease processes. In most cases when the oral temperature is 37.8°C (100°F) or over, fever is present. Temperatures of 40°C (104°F) or over are common in serious illnesses, although occasionally very high fever accompanies an illness that causes little concern. Temperatures as high as 41.7°C (107°F) or higher sometimes accompany diseases in critical stages. Subnormal temperatures, below 35.6°C (96°F) occur in cases of collapse; see also symptomatic hypothermia.
absolute temperature (T) that reckoned from absolute zero (−273.15°C), expressed on an absolute scale.
basal body temperature (BBT) the temperature of the body under conditions of absolute rest; it has a slight sustained rise during the luteal phase of the menstrual cycle and can be used as an indirect indicator of when ovulation has occurred.
body temperature the temperature of the body of a human or animal; see temperature.
core temperature the temperature of structures deep within the body, as opposed to peripheral temperature such as that of the skin.
critical temperature that below which a gas may be converted to a liquid by increased pressure.
normal temperature the body temperature usually registered by a healthy person, averaging 37°C (98.6°F).
risk for imbalanced body temperature a nursing diagnosis accepted by the North American Nursing Diagnosis Association, defined as a state in which an individual is at risk of failure to maintain body temperature within the normal range.
subnormal temperature temperature below the normal. See also symptomatic hypothermia.


(tem'pĕr-ă-chŭr), Avoid using this word as a synonym for fever.
The sensible intensity of heat of any substance; the manifestation of the average kinetic energy of the molecules making up a substance due to heat agitation.
See also: scale.
[L. temperatura, due measure, temperature, fr. tempero, to proportion duly]


/tem·per·a·ture/ (tem´per-ah-chur)
1. an expression of heat or coldness in terms of a specific scale; a measure of the average kinetic energy due to thermal agitation of the particles in a system. Symbol .
2. the level of heat natural to a living being.
3. colloquial term for fever.

absolute temperature  (T ) that reckoned from absolute zero (−273.15°C or −459.67°F), expressed on an absolute scale.
basal body temperature  (BBT) the temperature of the body under conditions of absolute rest.
core temperature  the temperature of structures deep within the body, as opposed to peripheral temperature such as that of the skin.
critical temperature  that below which a gas may be converted to a liquid by increased pressure.
normal temperature  that of the human body in health, about 98.6°F or 37°C when measured orally.


(tĕm′pər-ə-cho͝or′, -chər, tĕm′prə-)
a. The degree of hotness or coldness of a body or environment.
b. A measure of the average kinetic energy of the particles in a sample of matter, expressed in terms of units or degrees designated on a standard scale.
a. The degree of heat in the body of a living organism, usually about 37.0°C (98.6°F) in humans.
b. An abnormally high condition of body heat caused by illness; a fever.

temperature (T)

Etymology: L, temperatura
1 a relative measure of sensible heat or cold.
2 (in physiology) a measure of sensible heat associated with the metabolism of the human body, normally maintained at a constant level of 98.6° F (37° C) by the thermotaxic nerve mechanism that balances heat gains and heat losses.
Usage notes: (informal)
a fever.

systemic inflammatory response syndrome

A term that 'was developed to imply a clinical response arising from a nonspecific insult and includes two or more of the following. See Sepsis, Septic shock, Severe sepsis.
Systemic inflammatory responses
Temperature < 36ºC or > 38ºC
Heart rate > 90 beats/min
Respiratory rate pCO2 < 32 mm Hg or > 20 breaths/min
WBC count < 4 x 109 or > 12 x 109 or , or the presence of > 0.10 immature neutrophils

sepsis syndrome

A constellation of signs, Sx, and systemic responses caused by a wide range of microorganisms that may eventuate into septic shock; SS is a systemic response to infection
Sepsis syndrome, defining parameters  
• Temperature Hypothermia < 35ºC–96ºF or hyperthermia > 39ºC–101ºF
• Tachycardia > 90 beats/minute
• Tachypnea > 20 breaths/minute
• Site of infection Clinically evident focus of infection or positive blood cultures
• Organ dysfunction 1+ end organs with either dysfunction or inadequate perfusion or cerebral dysfunction
• Metabolic derangement Hypoxia–PaO2 < 75 mm Hg, ↑ plasma lactate/unexplained metabolic acidosis
• Fluid imbalance Oliguria–< 30 mL/hr
• WBC counts < 2.0 x 109/L; > 12.0 x 109/L–US: < 2000/mm3; > 12 000/mm3
Note: The confusing semantics of the terms sepsis, sepsis/septic syndrome, and septic shock are unlikely to be resolved in the forseeable future; the terms sepsis and septic syndrome are essentially interchangeable and would in part overlap with septicemia–the early components of a pernicious infectious cascade that has spilled into the circulation; the term septic shock is used when the process becomes virtually irreversible.


The sensible intensity of heat of any substance; the manifestation of the average kinetic energy of the molecules making up a substance due to heat agitation.
See also: scale
[L. temperatura, due measure, temperature, fr. tempero, to proportion duly]


(tem'pe(r)-choor?) [L. temperatura, proportion]
Enlarge picture
TEMPERATURE REGULATION: Effects of changes in body temperature
The degree of hotness or coldness of a substance. See: illustration

absolute temperature

The temperature measured from absolute zero, which is -273.15°C.

ambient temperature

The surrounding temperature or that present in the place, site, or location indicated.

axillary temperature

The temperature obtained by placing a thermometer in the apex of the axilla with the arm pressed closely to the side of the body for the time recommended by the manufacturer of the thermometer. The temperature obtained by this method is usually 0.5° to 1.0°F (0.28° to 0.56°C) lower than oral.
See: Temperature: Axillary

body temperature

A marker of endocrine, metabolic, or muscle activity; the response of the body to heat or cold in the environment; or the presence of infection, inflammation, among other illnesses; it is one of the vital signs. Body temperature varies with the time of day and the site of measurement. Oral temperature is usually 97.5° to 99.5°F (36° to 38°C). Daily fluctuations in an individual may be 1° or 2°F. Body temperature may be measured by a placing a thermometer in the mouth, the rectum, under the arm, in the bladder, within the chambers of the heart, or in the external auditory canal of the ear. Rectal temperature is usually from 0.5° to 1.0°F (0.28° to 0.56°C) higher than by mouth; axillary temperature is about 0.5°F (0.28°C) lower than by mouth. Oral temperature measurement may be inaccurate if performed just after the patient has ingested cold or hot substances or has been breathing with an open mouth.

Body temperature is regulated by thermoregulatory centers in the hypothalamus that balance heat production and heat loss. Eighty-five percent of body heat is lost through the skin (radiation, conduction, sweating) and the remainder through the lungs and fecal and urinary excretions. Muscular work (including shivering) is a mechanism for raising body temperature. Elevation of temperature above normal is called fever (pyrexia), and subnormal temperature is hypothermia. Other factors that can influence body temperature are age (infants and children have a wider range of body temperature than adults, and elderly have lower body temperatures than others); menstruation cycle in women (the temperature rises in the ovulatory midcycle and remains high until menses); and exercise (temperature rises with moderate to vigorous muscular activity).

core temperature

The body's temperature in deep internal structures, such as the heart or bladder, as opposed to peripheral parts such as the mouth or axilla. In critical care it is often measured with a thermometer linked to a central venous catheter or pulmonary artery catheter.

critical temperature

The temperature above which distinct liquid and gas phases do not exist.

inverse temperature

A condition in which the body temperature is higher in the morning than in the evening.

maximum temperature

The temperature above which bacterial growth will not take place.

mean temperature

The average temperature for a stated period in a given locality.

minimum temperature

In bacteriology, the temperature below which bacterial growth will not take place.

normal temperature

The temperature of the body, taken orally, in a healthy individual: normally 97.5° to 99.5°F (36° to 38°C).

optimum temperature

The temperature at which a procedure is best carried out, such as the culture of a given organism or the action of an enzyme.

oral temperature

The temperature obtained by placing a thermometer under the patient's tongue with lips closed for 3 min or by electronic thermometer for the length of time noted on the readout or the manufacturer's direction.

Patient care

It should not be taken for at least 20 min after ingestion of hot or cold liquids. It is not advisable for infants, those who breathe through the mouth, the comatose or obtunded patients, or the critically ill.

See: Temperature: Oral

rectal temperature

The temperature obtained by inserting a thermometer into the anal canal to a depth of at least 112 in (3.8 cm) and holding it in place for 3 to 5 min or, for electronic thermometers, according to the manufacturer's directions. This method should not be used following a rectal operation or if the rectum is diseased. A rectal temperature is more accurate than either oral or axillary temperatures. It averages about 1°F (0.56°C) higher than the oral temperature and approx. 1.5°F (0.84°C) higher than the axillary temperature.
See: Temperature :Rectal

room temperature

The temperature between 65° and 80°F (18.3° and 26.7°C).

subnormal temperature

A body temperature below the normal range of 97.5° to 99.5°F (36° to 38°C).

tympanic temperature

The temperature obtained by placing an electronic probe in the ear canal. Such a reading measures the temperature in the capillary bed of the tympanic membrane and is generally reflective of the core temperature.
See: ear thermometry; thermometer, tympanic


the degree of hotness or coldness, usually related to a zero at the melting point of ice (Celsius scale) or absolute zero (Kelvin scale).


heat content, i.e. measure of kinetic energy of molecules within a substance
  • axillary temperature 36°C

  • normal body temperature; core body temperature 37°C (98.4°F)

  • skin temperature of feet ~ 31°C (note: toe pulps are often up to 5°C cooler); skin temperature is dependent on vascular status of lower limb, recent activity levels, footwear type, environmental temperature and skin site tested


n the degree of sensible heat or cold.
temperature, body,
n the measurable temperature of the body. Normal range of variations, 98°F to 99°F (35.5°C to 37°C) orally and 99°F to 100°F (37°C to 38°C) rectally, with much wider ranges for skin.
temperature, body, regulation,
n homeostasis of body temperature. Results from a balance of heat production (external heat plus heat from muscle contraction and other chemical processes) and heat loss (through lungs, sweating, surface radiation, and excretions).
temperature, casting,
n the required degree of heat necessary to bring a metal to proper fluidity for introduction into a refractory mold.
temperature, core,
n the temperature of the internal tissues of the body, this temperature stays stable, unlike the temperature of the outer body surfaces, which are affected by the environment.
temperature, recrystallization,
n the lowest temperature at which the distorted grain structure of a cold-worked metal is replaced by a new, strain-free grain structure during prolonged annealing. Time, purity of metal, and prior deformation are important factors.


the degree of sensible heat or cold, expressed in terms of a specific scale. See also hypothermia, hyperthermia.

absolute temperature
that reckoned from absolute zero (−459.67°F or −273.15°C).
air temperature
the temperature of the surrounding air as measured by a dry-bulb thermometer.
ambient temperature
temperature of the immediate environment.
body temperature
a prime technique for assessing health status of a patient. Always a rectal temperature. Average temperatures above which hyperthermia, pyrexia or fever can be said to occur are listed under pyrexia.
critical temperature
1. that below which a gas may be converted to a liquid by pressure.
2. the environmental temperature at which the body is unable to maintain a constant body temperature and at which heat production must be increased (cold temperatures) or at which heat loss must be increased (high temperatures).
effective temperature
the combination of air temperature, humidity and wind speed. See also temperateness index.
environmental temperature
air temperature.
nonpermissive temperature
one at which a conditional gene mutation is nonfunctional. See also temperature-sensitive mutation.
normal body temperature
that usually registered by a healthy animal. See pyrexia.
permissive temperature
one at which a conditional gene mutation can express its normal function. See also temperature-sensitive mutation.
premortal temperature fall
the sudden fall in body temperature of a previously fevered animal just before death.
rectal temperature
the body temperature as measured by a rectal thermometer which has been in situ and in contact with the mucosa of the rectum with the anal sphincter tightly closed for at least 30 seconds. Alternative equipment is a dipolar electrode in a rectal probe.
temperature stress
exposure to excessively high or low environmental temperature.
windchill temperature
a combination of wind velocity and air temperature. See also effective temperature (above).

Patient discussion about temperature

Q. what is the red line when your body temperature drops before you are getting hypothermia?

A. Hypothermia is a condition in which an organism's temperature drops below that required for normal metabolism and function. For people in stage 1 hypethermia, body temperature drops by 1-2°C below normal temperature (35-36°C). Mild to strong shivering occurs. In stage 2, body temperature drops by 2-4°C (35-33 degrees). Shivering becomes more violent. Muscle mis-coordination becomes apparent and movements are slow and labored and there is mild confusuin. In stage 3, body temperature drops below approximately 32 °C (89.6 °F). Shivering usually stops and there's difficulty speaking, sluggish thinking, and amnesia start to appear. Cellular metabolic processes shut down. This is life threatening.

Q. I feel that my temperature is rising, I am worried as it was told to me to not take on any medicine? I am currently in my 1st trimesters and last week I had fever over 100. I took paracetamol and I got well. Again today I feel that my temperature is rising and it has gone pretty high. My body is on high pain l and I think I must meet a doctor this time. What you guys have to say……I am worried as it was told to me to not take on any medicine but I had taken one ………what can happen?

A. First, congratulations for the pregnancy. I agree with falseact, you should see your OB-GYN doctor for a consult. But here I paste a data that might be useful to calm your worry..

Acetaminophen or paracetamol labeling, like all OTC medications, instructs consumers who are pregnant or nursing a baby to contact their doctor before use. Acetaminophen or paracetamol has been used for over 40 years and available data indicate that acetaminophen in therapeutic doses does not adversely affect the pregnant mother or the fetus.

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