Influence of number of pre-embryos transferred, progesterone level and oestradiol/progesterone ratio at thaw on pregnancy results during replacement of cryopreserved pre-embryos in natural cycles.
When frozen-thawed pre-embryos were transferred in a natural menstrual cycle, a clinical pregnancy rate of 22% per transfer cycle was obtained. The pregnancy rates were higher when serum progesterone levels at thaw were less than or equal to 3.4 ng/ml than when they were greater than or equal to 3.5 ng/ml. This was reflected in a significantly higher oestradiol/progesterone ratio at thaw in the conception cycles than in the non-conception cycles.
Irianni
F M
FM
Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk 23507.
Veeck
L L
LL
Toner
J P
JP
Muasher
S J
SJ
D000328:Adult; D015925:Cryopreservation; D004624:Embryo Transfer / Q000379:methods*; D004622:Embryo, Mammalian; D004958:Estradiol / Q000097:blood*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011374:Progesterone / Q000097:blood*
D011374:Progesterone; D004958:Estradiol