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. 2018 Mar 19;9:92. doi: 10.3389/fendo.2018.00092

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Copyright © 2018 Thomsen, Kesmodel, Andersen and Humaidan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Time for maximum P₄ concentration (acrophase) in 10 women undergoing IVF treatment. As seen, five women had their P₄ acrophase before noon and five after noon. The same pattern was seen for P₄ nadir.