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What is the best day to do a blood test to examine female fertility?

By Andrea Rodrigo B.Sc., M.Sc. (embryologist).
Last Update: 11/27/2016

Ideally, in order to obtain an accurate result for FSH, LH and estradiol levels, it should be done on day 3 of the cycle, after the start of the menstrual period. Progesterone, on the other hand, should be tested on day 21. Finally, AMH levels can be checked at any time during the cycle, as its levels are independent from the cycle.

 Andrea Rodrigo
Andrea Rodrigo
B.Sc., M.Sc.
Embryologist
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
Embryologist. Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.