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The concentration of progesterone has been measured in ten women at 34–35 weeks of gestation in blood samples taken at 30 or 60 min intervals during a 24 h study period. Plasma progesterone concentrations showed a distinct diurnal rhythm. Most values determined between 04.00 and 11.00 h were significantly lower than the peak concentrations measured between 13.00 and 01.00 h. The relation of these changes in plasma progesterone to those in plasma cortisol and oestrogens is discussed.

This article has been cited by other articles:

				W. Cheng, O. D. Lau, and N. A. Abumrad Two Antiatherogenic Effects of Progesterone on Human Macrophages; Inhibition of Cholesteryl Ester Synthesis and Block of Its Enhancement by Glucocorticoids J. Clin. Endocrinol. Metab., January 1, 1999; 84(1): 265 - 271. [Abstract] [Full Text]