Effect of progesterone, administered via intravaginal rings, on serum concentrations of oestradiol, FSH, LH and prolactin in women |
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Authors: | T B?ckstr?m K Carlstr?m B von Schoultz J Toivonen |
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Abstract: | Intravaginal rings containing progesterone were inserted on Day 5 of the cycle to 8 healthy, normally menstruating women. Blood samples were taken during Days 4--22 of the cycle at 2--3-day intervals. The plasma progesterone levels obtained after the insertion were between 7.5 and 21 nmol/l. Four subjects showed no increase in plasma oestradiol concentrations. The subjects showing increased plasma oestradiol levels also showed a positive feedback on LH, resulting in ovulation or an LH peak. The results suggest that progesterone may have a local inhibitory effect on the follicular oestradiol production. |
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