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Basal Body Temperature 
(B.B.T.)

How does the Basal Body Temperature method work

Keeping a record of your basal body temperature (B.B.T.) is an inexpensive and easy way to determine when and whether you are ovulating.  A woman's basal body temperature drops briefly and then rises half a degree following ovulation, and remains elevated until the start of the next period.
 

How do I prepare the BBT chart

The infertility clinic will provide you with a temperature chart and explain in detail how to record your temperature on it. In order to be able to maintain the chart properly, you must be able to read a thermometer with accuracy.  If you are uncertain about this, request the clinic staff to coach you. You should use a proper infertility thermometer (preferably with a Centigrade scale). This is available at most major chemist shops.

Each chart represents a cycle that begins from the first day of a period (day 1 of the chart), and continues until the next period begins. When you have completed the first chart, you then commence a new chart. Your body temperature is recorded on the chart when you wake up every morning. The points representing different temperatures are joined up to make a graph. The best temperature charts take the form of a display sheet making up six cycles. Normal BBT is between 96 and 98 degrees. This temperature rises to 97 and 98 degrees after ovulation.  If this rise in temperature persists for at least 3 days, it means that ovulation has taken place.  The temperature then remains raised until it falls once more with the onset of a period. The fall and subsequent rise in temperature represents ovulation.
 

How does the rise in BBT indicate ovulation

Your basal body temperature when you wake up in the morning reflects changes in your progesterone output. The rise and fall of progesterone levels in your body follows a pattern very similar to the body temperature during this part of the cycle. If you do not ovulate, you do not produce progesterone and your temperature will remain low. The temperature chart is therefore plotting changes in your progesterone production, and can be used by your specialist to determine the normality of your ovulation. If you have intercourse at the time of the dip in temperature and "chase" the temperature rise, you will not miss ovulation if and when it occurs. 
 

For how long do I need to maintain BBT charts

If there is a problem with ovulation, it should show up if you have maintained the charts properly for two to three months. The phase of the cycle after ovulation (luteal phase) should show an raised temperature lasting for at least eleven days for a pregnancy to be possible. If it is confirmed that there is a problem with ovulation, there are a number of treatments available.
 

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