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A member asked:
If i got a postive opk test on cycle day 18 and doc took a preogesterone test on cycle day 28. is it to late to see if ovulated with blood test?
2 doctors weighed in across 2 answers
Close: Your Progesterone level should peak about a week after ovulation, and you will generally ovulate the day after the kit is positive. So, you are checking the Progesterone about 9 days after ovulation. It is close enough that the Progesterone should be fairly accurate.
Answered 6/30/2014
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Not too early: If your OPK is correct about ovulation on cd 18 a serum Progesterone will have risen within 3-5 days, so cd 28 is good.
Answered 2/13/2015
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