PREGNANCY RATES IN DONORS VERSUS RECIPIENTS ACCORDING TO THE SERUM PROGESTERONE LEVEL AT THE TIME OF HUMAN CHORIONIC-GONADOTROPIN IN A SHARED OOCYTE PROGRAM

Previous data suggested a subtle increase in serum P at the time of hC G injection without LH surge reduces the PR of women having oocyte ret rievals for IVF; this study compared PRs of recipients in a shared ooc yte program according to the donors' pre-hCG P level. There was no dif ference in viable PRs between recipients and donors when P less than o r equal to 1 ng/mL. The PR was similar for recipients when donors' P w as >1 ng/mL (12.7%). Donors with P > 1 ng/mL had the lowest PR: 7.2%. The data suggest that the adverse effect of higher serum P without LH surge may be on the endometrium rather than the oocyte.