Morphology and the sperm penetration assay.

Area of Science:

• Reproductive Medicine
• Andrology
• Infertility Diagnostics

Background:

• Sperm morphology assessment, particularly using the Kruger strict criteria, is a common component of semen analysis.
• Its predictive value for male fertility and assisted reproductive technology (ART) outcomes remains a subject of investigation.
• The sperm penetration assay (SPA) is a functional test assessing sperm's ability to penetrate oocytes.

Purpose of the Study:

• To evaluate the predictive capability of Kruger morphology for the results of the sperm penetration assay (SPA).
• To determine if Kruger morphology can serve as a substitute for functional sperm tests in infertility evaluations.

Main Methods:

• Retrospective review of 115 infertile patients undergoing semen analysis and the optimized zona-free hamster egg sperm penetration assay (O-HESPA) between 1997-2000.
• Statistical analysis included univariate and multivariate analysis, t tests, and logistic regression.
• Examined the correlation between Kruger morphology, sperm count, and viability with SPA (referred to as SCI in results) outcomes.

Main Results:

• Univariate analysis showed significant correlations between SPA results and sperm count, viability, and Kruger morphology.
• Multivariate analysis identified significant correlations between SPA results and sperm count and viability only.
• Logistic regression revealed that sperm count was the sole statistically significant predictor of SPA results; Kruger morphology showed no correlation.

Conclusions:

• Kruger morphology assessment is not a reliable predictor of sperm penetration assay (SPA) results.
• Morphology assessment cannot replace functional sperm tests in the clinical management of infertile couples.
• Sperm count remains a critical factor in predicting male fertility potential.