Temperature of a body at full rest; basal refers
to baseline. Basal Body Temperature (BBT) measurements are often used to chart and track
women's fertility, as temperature fluctuations generally follow the ovulatory cycle.
For purposes of trying to conceive, it is recommended that women take their temperature immediately
upon waking and before they rise or ingest anything. Though not absolutely necessary, a special
BBT thermometer provides the most accurate reading.