Our expert says:
In general the progesterone level exceeding 15 may already be indicative of a post-ovulation corpus luteal function. However levels above 40 are more in keeping with reasonably good ovulation and certainly in stimulated cycles where clomid is used it would be expected that levels should exceed at least 25.
However it is important to note that progesterone testing is simply an indirect test of corpus luteal function and does not categorically prove that ovulation has occurred. Certain syndromes such as lutenised unruptured follicle syndrome (LUF syndrome) and empty follicle syndrome (EFS) may result in high progesterone levels without actual release of an egg taking place.
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