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- W2045236815 abstract "Abstract Peripheral plasma levels of 20α-dihydroprogesterone (20α-OHP), progesterone (P) and 17-hydroxypro-gesterone (17-OHP) were determined daily throughout the menstrual cycle of five healthy women and in four-hourly samples collected during the follicular and luteal phases. LH was determined daily and, taking the LH peak as day 0, the mean concentration for 20α-OHP in ng/ml was 0.46 on day −8; 0.90 on day 0 and rose to 6.20 on day +9. The mean for P in ng/ml on day −8 was 0.40; 1.20 on day 0 and rose to 17.70 on day +7. There was evidence for the presence of two small peaks of 17-OHP on days 0 and +2. In the follicular phase, 20α-OHP and P showed minor fluctuations of a reciprocal nature until day −6 after which the P values increased threefold and the 20α-OHP values twofold. There was clear evidence of a nycterohemeral variation in the concentrations of 17-OHP with maximum values at 8.00. The variations in four-hourly samples for 20α-OHP and P showed reverse patterns—the highest concentration of the former at 20.00 coinciding, in general, with the lowest concentrations of the latter. Changes were observed in these four-hourly variations at different times in the menstrual cycle." @default.
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- W2045236815 date "1976-10-01" @default.
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- W2045236815 title "Plasma 20α-dihydroprogesterone progesterone and 17-hydroxyprogesterone: daily and four-hourly variations during the menstrual cycle" @default.
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- W2045236815 doi "https://doi.org/10.1016/0022-4731(76)90178-3" @default.
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