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The effect of pregnancy on hepatic drug-metabolizing enzyme activity was investigated in nine healthy pregnant women using the ratio of 6-hydroxycortisol (6-OHF), to total 17-hydroxycorticosteroid (17-OHCS) in 24-hour urine as an index of the hepatic monooxygenase activity. The values of 6-OHF and the ratio (713 +/- 250 micrograms/d and 0.323 +/- 0.242; mean +/- SD) before delivery were significantly higher than they were during early puerperium (395 +/- 145 micrograms/d and 0.114 +/- 0.055) and approximately three months after delivery (237 +/- 67 micrograms/d and 0.066 +/- 0.034). Although the values three months after delivery were comparable to those found in the nonpregnant group (n = 10; 228 +/- 48 micrograms/d and 0.081 +/- 0.031), 6-OHF values one week after delivery were significantly higher than those observed in the control group. These observations suggest that drug-metabolizing enzyme induction may occur during pregnancy.
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