What does BBT stand for?

Medically, BBT stands for Basal Body Temperature - the lowest value for the day, which typically exists just after waking from a night's sleep. It can be used in estimating a woman's ovulation date because the BBT is lower immediately before ovulation and higher immediately after ovulation.

* BBT can also stand for Big Bang Theory, Broad Based Training, or the textspeak phrase "be back tomorrow."