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MoonDragon's Pregnancy Information
OVULATION TEMPERATURE CHANGES




Just prior to ovulation, when your estrogen level has reached its peak, a drop in your basal body temperature will occur. However, following ovulation, there is a rise in your body temperature. When the temperature remains elevated for three days, ovulation is thought to have occurred.

typical menstrual cycle


BASAL BODY TEMPERATURE

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, although the temperature measured at that time is somewhat higher than the true 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 awareness.

BBT Chart Example


HORMONAL CAUSES OF BIPHASIC PATTERNS

The higher levels of estrogen present during the pre-ovulatory (follicular) phase of the menstrual cycle lower BBTs. The higher levels of progesterone released by the corpus luteum after ovulation raise BBTs. The rise in temperatures can most commonly be seen the day after ovulation, but this varies and BBTs can only be used to estimate ovulation within a three day range.

If pregnancy does not occur, the disintegration of the corpus luteum causes a drop in BBTs that roughly coincides with the onset of the next menstruation. If pregnancy does occur, the corpus luteum continues to function (and maintain high BBTs) for the first trimester of the pregnancy. After the first trimester, the woman's body temperature drops to her pre-ovulatory normal as the placenta takes over functions previously performed by the corpus luteum.

Very rarely, the corpus luteum may form a cyst. A corpus luteum cyst will cause BBTs to stay elevated and prevent menstruation from occurring until it resolves, which could take weeks or months.

PREDICTING OVULATION

Taking your basal body temperature has to do with predicting ovulation (and then deciding whether or not to have intercourse) not with predicting pregnancy. Pregnancy may or may not occur, depending on which day you had intercourse this month.

CONCEPTION - TRYING TO CONCEIVE

Regular menstrual cycles are often taken as evidence that a woman is ovulating normally, and irregular cycles is evidence she is not. However, many women with irregular cycles do ovulate normally, and some with regular cycles are actually annovulatory or have a luteal phase defect. Records of basal body temperatures can be used to accurately determine if a woman is ovulating, and if the length of the post-ovulatory (luteal) phase of her menstrual cycle is sufficient to sustain a pregnancy.

Pregnancy tests are not accurate until 1 to 2 weeks after ovulation. Knowing an estimated date of ovulation can prevent a woman from getting false negative results due to testing too early. Also, 18 consecutive days of elevated temperatures means a woman is almost certainly pregnant.

Tracking basal body temperatures are a more accurate method of estimating gestational age than tracking menstrual periods.

CONTRACEPTION - TRYING TO AVOID PREGNANCY

Charting of basal body temperatures is used in some methods of fertility awareness, and may be used to determine the onset of post-ovulatory infertility. However, BBTs only show when ovulation has occurred; they do not predict ovulation. Normal sperm life is up to five days, making prediction of ovulation several days in advance necessary for avoiding pregnancy. BBT-only methods often use a rule similar to that of calendar-based methods to determine the beginning of the pre-ovulatory fertile phase.

USING A BASAL THERMOMETER

Glass fever thermometers typically have markings every 0.2°F (0.1°C). Basal thermometers require accuracy of at least 0.1°F (0.05°C), so special glass basal thermometers are sold separately from glass fever thermometers. All digital thermometers generally read to at least 0.1°F (0.05°C) and so are suitable for monitoring basal temperatures. Some digital thermometers are marketed as "basal thermometers" and have extra features such as a larger display, expanded memory functions, or beeping to confirm the thermometer is placed properly. Some fertility monitors determine the fertile and infertile portions of the menstrual cycle by interpreting basal body temperature records.




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    HELPFUL CONCEPTION-RELATED LINKS

    MoonDragon's Contraception Information: Fertility Basics
    MoonDragon's Contraception Information: Mucus Observation
    MoonDragon's Contraception Information: Natural Family Planning
    MoonDragon's Pregnancy Information: Ovulation & Getting Pregnant
    Sister Zeus: Using Your Basal Body Temp In Determining Risk of Pregnancy
    MoonDragon's Pregnancy Information Index
    MoonDragon's Pregnancy Information & Survival Tips






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