[Total estrogens and estrogen-creatinine ratio in pregnancy].

The ratio of estrogen excretion in urine (milligrams per 24 h) divided by creatinine (grams per 24 h) was determined in 571 specimens of 307 pregnant women and compared with total estrogen determinations. Use of estrogen-creatinine ratio reduced the daily variations of total estrogen values by one third resulting in a mean curve with less standard deviation.