Intrauterine insemination-ready versus conventional semen cryopreservationfor donor insemination: a comparison of retrospective results and a prospective, randomized trial

Objective: To compare fecundity rates following intrauterine insemination ( IUI) with donor sperm frozen conventionally versus an IUI-ready preparation . Design: Both retrospective results and a prospective, randomized study wher e recipients were assigned to one of two sperm cryopreservation methods in each cycle of intrauterine insemination are reported. Setting: University-based infertility practice, affiliated private practice s, and andrology laboratory. Patient(s): Women desiring therapeutic insemination in an effort to establi sh pregnancy. Intervention(s): Intrauterine insemination with donor sperm frozen conventi onally or by an TUI-ready protocol. Main Outcome Measure(s): Cycle fecundity in donor IUI recipients. Result(s): In a retrospective analysis involving 642 inseminations in 209 r ecipients, 79 pregnancies were recorded for an overall pregnancy rate of 12 .3% per insemination (or cycle): 11.3% with IUI-ready sperm and 13.9% with conventionally preserved sperm. In a follow-up prospective, randomized stud y, the pregnancy rate for IUI-ready sperm preparations was 36% per cycle (1 4 of 39) whereas that for conventionally preserved sperm was 19.6% per cycl e (9 of 46). Thirteen of the 23 pregnancies occurred in the first study cyc le of insemination; only two pregnancies were observed in patients undergoi ng more than four cycles of insemination. Conclusion(s): Cycle fecundity for IUI-ready donor sperm is equivalent to c onventional cryopreserved sperm based on both prospective and retrospective assessments. (C) 2001 by American Society for Reproductive Medicine.