Effect of progesterone, administered via intravaginal rings, on serum concentrations of oestradiol, FSH, LH and prolactin in women.


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… (More)


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