the use of basal body temperature ( bbt ) recording and a single progesterone ( p ) level at the time of the endometrial biopsy in the late luteal phase improved our ability to predict the onset of the next menstrual period ( nmp ) and determine the postovulatory day ( pod ) in 124 regularly menstruating infertile women .
C0033308
progesterone
C0021361
infertile