Abstract
There is no consensus on whether serum progesterone (P4) levels should be measured during IVF cycles. Studies that have suggested the benefit of measuring P4 have identified different thresholds above which there may be a reduction in implantation rates (IRs). However, the majority of these studies did not adjust for critical confounding factors. Therefore, we investigated whether serum P4 levels on the day of trigger influence the implantation potential of embryos by including only young women who had transfers of good-quality blastocyst(s) on day 5.
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