This test is an excellent way to determine thyroid function using basal body temperature (the body's temperature at rest). If the thyroid is running low, the body's temperature will drop below normal while the body is at rest-sleep. This test is done by measuring the underarm temperature upon waking after a night's sleep. For accuracy, the test is performed five mornings in a row and then the average is calculated. The instructions for performing the test are as follows:

The night before, shake down the thermometer (an oral glass thermometer only), and set it on the nightstand next to the bed.
Immediately upon waking, without raising your head from the pillow, place the thermometer under the arm.
Leave thermometer under arm for 10 minutes.
Move as little as possible in this process; you must remain flat on your back during this entire time otherwise the thyroid gland will be activated and a false reading will be taken.
After ten minutes, remove the thermometer and record temperature.
The test is invalidated if you expend any energy before recording the temperature, i.e., getting up for any reason, shaking the thermometer, etc.

TEST RESULTSDateTemperature
Day 1
Day 2
Day 3
Day 4
Day 5

To figure average --> Total____________ divided by 5 = __________.

An average temperature of between 97.8 and 98.2 degrees is considered normal.