Urinary pregnanediol and creatinine excretion in the female of menstrual age

The urinary pregnanediol and creatinine excretions in females of menstrual age were correlated. The high degree of correlation found allows the use of the pregnanediol/creatinine ratio of the first-morning voided urinary specimen in calculating, with a fair degree of precision, the 24-hr. pregnanediol excretion.