basal body temperature

(redirected from Basal temperature)
Also found in: Dictionary, Thesaurus.
Related to Basal temperature: basal temperature chart


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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ba·sal bod·y tem·per·a·ture (BBT),

the temperature at rest, usually obtained on arising in the morning, without any influences that might increase it; can give indirect evidence of ovulation.
Farlex Partner Medical Dictionary © Farlex 2012

basal body temperature

The lowest normal body temperature that occurs during rest or sleep. Measurement of BBT is a popular method for determining whether ovulation has occurred, as the body temperature is 0.25–0.5ºCº (0.5–1.0ºF) higher post-ovulation.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

basal body temperature

Reproduction medicine The lowest possible normal body temperature, which usually occurs in the morning before getting out of bed; measurement of BBT is a popular method for determining whether ovulation has occurred. See Anovulatory cycle.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

ba·sal bod·y tem·per·a·ture

(bāsăl bodē tempĕr-ă-chŭr)
Temperature at rest, usually obtained on arising in the morning, without any influences that might increase it; can give indirect evidence of ovulation.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Another potential method for use in this work would be that proposed by Ometto (1981), because this method considers not only the lower basal temperature, but also the upper basal temperature, so in days with temperature that exceed the upper basal temperature, it is not considered.
Basal temperatures (0') of the subcutaneous tissue (GDD: 30.6 [+ or -] 0.4 vs GSM: 30.7 [+ or -] 0.4[degrees]C; p = 0.704) were similar in both groups (Figure 4).
A typical basal temperature chart looks like the one below.
To keep track of the thermal changes in the woman's cycle, she should record her basal temperature on a chart each morning and connect each dot with a line.
An individual patient's symptoms, response to the hormones, and basal temperatures determined their dosage of thyroid hormones ....
The lower or minimum basal temperature for mango tree growth found in the literature is 10[degrees]C, given as the temperature below which there is plant growth shutdown (LUCENA, 2006; BARROS et al., 2010).
During this time, the woman's basal temperature will be low.
Besides changes in cervical mucus and basal temperature, other signs of approaching ovulation include tenderness and a slight increase in size of the breasts, pain in the lower abdomen, a tendency to be more emotional, and an increase in sexual desire.
Gambee believes that the diagnosis of hypothyroidism is a clinical diagnosis made by understanding the patient history, examining the patient, assessing basal temperature, measuring thyroid functioning, and treating the patient with thyroid USP supplement.
A: You can tell if the spotting is the real beginning of your period by checking your basal temperature. If the temperature has started to drop from its elevated phase, then the spotting is the beginning of the period.