Influence of a short or long abstinence period on semen parameters in the ejaculate of patients with nonobstructive azoospermia

Objective: To compare the effect of a short (4 days) or a long (14 days) ab stinence period on sperm retrieval by extended sperm preparation in patient s with nonobstructive azoospermia scheduled for testicular biopsy and intra cytoplasmic sperm injection (ICSI). Design: A prospective case control study. Setting: Male infertility clinic in a university hospital. Patient(s): Fifty male patients with nonobstructive azoospermia, scheduled for testicular biopsy for ICSI. Intervention(s): Diagnosis of nonobstructive azoospermia and a thorough mic roscopic search for sperm cells (extended sperm preparation). Main Outcome Measure(s): The number of sperm cells collected, sperm motilit y, and total motile sperm count after short and long abstinence periods. Result(s): There was a significant difference between long and short abstin ence with an increase in sperm count (log-to-log transformed analysis of va riance P<.025) and total motile sperm (P<.025 analysis of variance, P<02 pa ired Student's t-test) in the former group, but no significant change in sp erm motility (Wilcoxon and paired Student's t-test). In 18 patients, sperm concentration and sperm motility were similar in a second collection, done after the same abstinence period, compared with the same parameters in the first sample. When at least 10 motile sperm were defined as the cutoff numb er, allowing ICSI without testicular biopsy, no significant differences wer e found between the two abstinence periods. No clinical or laboratory male characteristic could predict the detection of 10 motile sperm by extended s perm preparation either after a short or a long abstinence period. Conclusion(s): Sperm count and total motile sperm were increased after a lo ng abstinence period, with no change in sperm motility. No additional advan tages were conferred by long abstinence as opposed to short abstinence when 10 motile sperm were defined as the cutoff number for ICSI. The recommende d period of abstinence for extended sperm preparation and ICSI, whether sho rt or long, should be individualized for each patient. (Fertil Steril(R) 20 01;76:485-90. (C) 2001 by American Society for Reproductive Medicine.).