Our expert says:
The progesterone level is consistent with an ovulatory pattern. The other results are within normal limits for this stage of the cycle. However, it is extremely important to note that the day 21 progesterone is an indirect assessment of corpus luteal function i.e. a cyst that arises from a follicle usually post ovulation. However, there are cases where ovulation itself, that is the release of the egg, does not takes place and the egg remains trapped inside the follicle. Such a condition is termed lutenised unruptured follicle syndrome (LUFS) and may give a high progesterone despite the fact that the egg has not been released and therefore strictly ovulation has not occurred.
Another condition that may mimic ovulation is the empty follicle syndrome where no egg is produced i.e the follicle is empty but may still be associated with elevated progesterone levels. Although these syndromes are rare they need to be considered in cases of prolonged infertility where progesterone levels indicate so-called ovulation.
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