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227 FET cycles P4 < 10 ng/ml in 37% of cycles LBR 17% versus 31 % ( P= 0.04) LBR difference 14% Cedrin‐Durnerin I et al., RBMO 2019 Conclusions unexplained infertility • Optimal function of the corpus luteum and the endometrium is crucial for live birth • Many other factors have a significant impact • Still a therapeutic challenge My prediction: • The term ”Unexplained infertility” will not exist in near future due to improved diagnostics and knowledge Crystal ball gazing 68 PRECONGRESS COURSE 09 I VIENNA, AUSTRIA – 23 JUNE 2019 71