Comparison between a two-layer discontinuous Percoll gradient and swim-up for sperm preparation on normal and...

Area of Science:

• Reproductive Biology
• Andrology
• Sperm Preparation Techniques

Background:

• Sperm preparation is crucial for assisted reproductive technologies.
• Choosing the optimal sperm preparation method impacts outcomes.
• Percoll gradient and swim-up are common techniques with distinct characteristics.

Purpose of the Study:

• To compare Percoll gradient and swim-up sperm preparation methods.
• To evaluate effects on progressive motility, sperm recovery, debris removal, and sperm morphology.
• To analyze sperm movement characteristics using computer-assisted analysis.

Main Methods:

• Analysis of 50 human semen samples (27 normal, 23 abnormal parameters).
• Comparison of Percoll gradient versus swim-up sperm preparation.
• Assessment of sperm concentration, progressive motility, motile sperm recovery, debris removal, and normal forms.
• Computer-assisted analysis of sperm velocity parameters (VCL, VSL) and head displacement.

Main Results:

• Percoll yielded higher sperm concentration than swim-up.
• Swim-up showed greater progressive motility, while Percoll achieved higher motile sperm recovery.
• Both methods effectively removed debris and yielded similar percentages of normal sperm forms.
• Swim-up sperm exhibited significantly higher curvilinear velocity (VCL) and straight-line velocity (VSL).

Conclusions:

• Percoll gradient is beneficial for preparing oligospermic samples due to higher motile sperm recovery.
• Swim-up is a simpler, standard choice for normal semen, yielding sperm with superior motility characteristics.