[Prognostic value on recovery rates for the application of sperm preparation techniques and their evaluation in sperm function].

Objective: To evaluate sperm recovery and total sperm motility in three different sperm preparation techniques (density gradient, simple washing and swim-up).

Patients And Methods: A total of 290 subjects were randomly evaluated from November 2001 to March 2003. The density gradient method required Isolate (upper and lower layers).