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Q&A: What is basal body temperature?

We've been trying to get pregnant, and a friend of mine told me to take my basal temperature. What is that, and does it really help?

Re: We've been trying to get pregnant, and a friend of mine told me to take my basal temperature. What is that, and does it really help?

The Bump Expert

Tracking your basal body temperature (BBT) can help pinpoint your ovulation date, and thus the best time to have sex. Take your BBT with a basal thermometer (sold at drugstores) first thing in the morning, before you do anything. This gives the most accurate reading -- even a quick bathroom dash can raise your body's core temp. Keep the thermometer on your bedside table along with a notebook to keep a daily record.

In the first two weeks of your cycle, before ovulation, BBT averages between 97.2 and 97.6 degrees. A day or two after ovulation, your body temp spikes between half a degree and a degree, and remains elevated until your next cycle begins. Keep in mind that from day to day, your BBT can fluctuate by half a degree or more. Don't be fooled by a little blip -- look for a sustained rise to confirm that you've ovulated.

The downside of BBT is that it shows when ovulation is over, not imminent. Track it for several months, though, and the info will give a sense of when you usually ovulate... Now just plan your sex life accordingly!

Paula Kashtan | April 30 , 2009 2:42 PM

Q&A: What is basal body temperature?

I take my BBT every morning at 5AM (I know, it's early, but at least I'm consistent!). I take it orally, though, and sometimes I move the thermometer around a bit before I'm satisfied with the position. This morning I had a lower temperature, and it beeped pretty soon after I had moved it. Could my temp be off because of moving it around in my mouth?

chelle540 | October 26 , 2009 12:54 PM

Q&A: What is basal body temperature?

yes

cherilynnmarie | December 08 , 2009 8:04 PM

Q&A: What is basal body temperature?

Yes, when you buy a thermometer and read the directions in the box, it tells you that your mouth has some heat pockets found on the sides under your tongue. That is where you need to place the tip of the thermometer. If you move it around you won't get an accurate reading. If you open your mouth while moving the thermometer around, you will loose heat.

syalelopes | December 24 , 2009 8:50 AM