Methods of semen preparation for intrauterine insemination and subsequent pregnancy rates.

Semen for insemination, either intrauterine or in vitro, must be prepared to remove seminal plasma products and/or select the healthier population of sperm prior to use. Traditionally, a double wash technique is performed, with or without subsequent swim-up to isolate the motile fraction if necessary. More recently, the use of the SperPrep filtration method has gained acceptance, with the benefits of removal of leukocytes and seminal debris from the specimen as well as enhancement of overall sperm quality. In the current study we compared the traditional double wash method without the swim-up to Sperm-Prep filtration. Intrauterine inseminations (IUI's) were performed in 307 cycles on 148 infertile couples at two different infertility centers in the USA. After complete diagnostic evaluation the couples were offered IUI before proceeding to any other form of assisted reproductive technologies. Semen samples were prepared in human tubal fluid media supplemented with 5% human serum albumin (HSA; location 1) or in Ham's F-10 media supplemented with 3% HSA (location 2), either with the SpermPrep filtration method (ZBL, Inc., Lexington, KY 40523, USA) or the double sperm wash (SW) procedure. Similar sperm numbers were used for the IUI procedure in both treatment groups and locations. The Sperm-Prep method resulted in significantly higher pregnancy rates (PR) than the SW procedure, independent of location. The clinical pregnancy rates per cycle were statistically lower (p < 0.05) in the SW group (20-22% vs. 9-10%). Of significant clinical importance, almost twice as many cycles were required in the SW group to achieve these pregnancies when compared to the SpermPrep group of patients.(ABSTRACT TRUNCATED AT 250 WORDS)