Spermatozoa selection by the swim-up procedure and two-layer percoll gradient centrifugation

Area of Science:

• Reproductive biology
• Andrology
• Sperm processing techniques

Background:

• Sperm processing is crucial for assisted reproductive technologies.
• Evaluating sperm processing methods is essential for optimizing outcomes.
• The swim-up procedure and Percoll gradient centrifugation are common techniques.

Purpose of the Study:

• To compare the efficiency of two-layer Percoll gradient centrifugation and the swim-up procedure for sperm processing.
• To assess the impact of initial sperm concentration on the performance of these methods.

Main Methods:

• Ejaculates from 47 infertile men were processed using both swim-up and two-layer Percoll gradient centrifugation.
• Sperm recovery rates, concentration loss, and motility were evaluated.
• Performance was analyzed across different initial sperm concentration categories (severe, moderate, mild oligospermia).

Main Results:

• Percoll gradients yielded significantly higher total sperm numbers with lower concentration loss compared to swim-up (-13.6% vs -70.8%).
• Sperm recovery in motility was significantly higher with Percoll gradients (34.8% vs -10.4%).
• Percoll technique showed superior sperm recovery across all oligospermia categories.

Conclusions:

• Two-layer Percoll gradient centrifugation is a more efficient sperm processing method than the swim-up procedure.
• Percoll gradients offer better sperm yield and motility recovery, particularly in cases of oligospermia.
• Percoll gradient centrifugation is recommended as the preferred method for sperm selection.