Basal Body Temperature ( BBT)
What is "Basal Body Temperature, BBT"
Basal body temperature is the lowest temperature attained by the body
during rest (usually during sleep). It is generally measured immediately
after awakening and before any physical activity has been undertaken.
The human body in a long time (6 hours or more) after sleep wake up before
any activity has not yet been measured body temperature is called the
basal body temperature. In women, ovulation causes an increase of one-half
to one degree Fahrenheit (one-quarter to one-half degree Celsius) in basal
body temperature (BBT); monitoring of BBTs is one way of estimating the
day of ovulation. The tendency of a woman to have lower temperatures before
ovulation, and higher temperatures afterwards, is known as a biphasic
pattern. Charting of this pattern may be used as a component of fertility
The principle of basal body temperature
Menstrual cycle to see the red menstrual cycle begins the first day of
the cycle length varies, ranging from about 21-35 days, average about
28 days, ovulation day which went separated into pre-ovulation follicular
phase, and the luteal phase after ovulation. Follicular phase length is
not necessarily, but the luteal phase under the sky fixed about 14 days.
The day after ovulation, due to the formation of ovarian corpus luteum,
progesterone secretion Celsius temperature rise will 0.6 degrees, leaving
the two-phase changes in high and low temperature. Sustained high temperature
of about 12-16 days (mean 14 days).
1, in the absence of pregnancy, luteal secretion of progesterone stops
shrinking, the temperature drops back to the basic line, menstrual cramps.
2, if already pregnant, due to the secretion of luteinizing hormone by
the embryo support, continue to secrete progesterone, the body temperature
constant high temperature.
3, if the ovarian dysfunction, there is no ovulation, no corpus luteum
formation, the temperature will continue to cool.
How to measure and record basal body temperature
1, buy a basic thermometer. Thermometer thermometer and the general based
on different scale of its dense, generally 36.7 degrees Celsius (scale
24) for the high and low temperature boundaries. (36 degrees - Scale 10;
38 degrees - scale 50).
2, thermometer based on the pillow at bedtime easy reach of the office
the next day wake up, not get up activities, measured on the tongue for
three minutes and record on the basis of the thermometer.
3, the morning temperature the amount of difficulty in mind, could a
fixed amount of time each day, can not remember half an hour prior intense
exercise or drinking hot and cold food.
4, menstrual cramps, and the same room at an additional sign to be marked,
in case of fever, excessive drinking evening to sleep at night so the
situation will affect the body temperature should also note that in particular.
Interpretation of the common changes in basal body
When menstruation comes, basal body temperature is low; ovulation, the
basal body temperature is converted to heat. In general, women in the
24 hours after ovulation, fertilization rate will become lower; However,
some sperm can survive in the female's womb for 72 hours. Therefore, basal
body temperature in women at low temperature, close to ovulation you should
have sex, you can have sex once every two days, which can increase the
chance of fertilization; if basal body temperature to high temperature
until further sexual intercourse, and that the chance of pregnancy has
2 ovarian function is not good
People with poor ovarian function, usually based on body temperature cycle
will be shortened, the original 28 days, may gradually becomes 24 days
or 22 days, the high temperature period is reduced accordingly.
High prolactin, high-temperature basal body temperature will shorten the
period of its poor quality eggs, so I do not get pregnant or easy abortion.
4. Susceptible to pregnancy
High-temperature basal body temperature rhythm of the fall (not easy during
pregnancy), low risk on the part of, but there will be individual differences
in low temperature period. For example for young girls, their ovarian
function is good, secretions and more dangerous to the appropriate length
of some sperm remain alive in the womb will be relatively high probability.
Therefore, it is likely the beginning 5 days before ovulation, it must
be seen as a dangerous period.
For infertility, basal body temperature can be
used as the reference and as the index for the progress of the treatment.
39Medical Center physician will take reference
of "basal body temperature" records, together with other observations,
diagnosis, and finally consider the best treatment