Computer-Aided Sperm Analysis (CASA) of sperm motility and hyperactivation

Area of Science:

• Reproductive Biology
• Andrology
• Sperm Function Analysis

Background:

• Progressive sperm motility is crucial for human fertilization, enabling sperm to navigate cervical mucus and reach the oocyte.
• Accurate assessment of sperm movement patterns (kinematics) is essential for evaluating male fertility.
• Existing methods require standardized protocols for reliable analysis.

Purpose of the Study:

• To provide a detailed protocol for assessing sperm motility using computer-aided sperm analysis (CASA).
• To enable reliable evaluation of sperm movement characteristics (kinematics) in semen and washed sperm suspensions.
• To facilitate the identification of clinically relevant sperm subpopulations based on motility and functional parameters.

Main Methods:

• Utilized a common computer-aided sperm analysis (CASA) system with phase contrast microscopy.
• Developed a protocol for assessing sperm movement pattern characteristics (kinematics).
• Applied multi-parametric definitions for cell-by-cell analysis of sperm subpopulations.

Main Results:

• The protocol allows for reliable assessment of sperm kinematics in semen.
• It also enables the calculation of motile and progressively motile percentages in washed sperm suspensions.
• CASA technology can identify specific sperm subpopulations with significant clinical implications, such as those with good mucus-penetrating ability or hyperactivation.

Conclusions:

• The described CASA protocol offers a standardized and reliable method for evaluating human sperm motility and kinematics.
• This methodology aids in identifying functional sperm subpopulations critical for reproductive potential.
• The protocol supports improved diagnostic accuracy in male infertility assessments.