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25% of patients had serum P4 levels < 30 nmol/l resulting in a significantly lower ongoing pregnancy rate (33%) compared to patients with higher P4 levels (51%) Conclusion: Low serum P4 levels on day of transfer is associated with reduced ongoing pregnancy rates 244 HRT‐FET blastocyst transfers – cohort study • January 2016 ‐ December 2017 • N=244 – HRT cycles (6 mg E2 + 90 mg vaginal Progesterone x 3) – Top‐quality blastocysts vitrified on day 5 or 6 – Serum progesterone measured on day of hCG Alsbjerg B et al, RBMO, 2018 66 PRECONGRESS COURSE 09 I VIENNA, AUSTRIA – 23 JUNE 2019 69
