January 20, 2026
Andrology: Key Sperm Parameters Explained
A semen analysis includes parameters like liquefaction, viscosity, color, agglutination, and pH. Normal pH is ≥7.2, and deviations may indicate issues with seminal vesicle function. High viscosity or agglutination can hinder sperm motility.
Key Takeaways
Liquefaction Time and Sperm Mobility
Fresh sperm samples should liquefy within 15-20 minutes. Failure to liquefy may trap sperm, preventing their movement into the uterus and reducing fertility potential.
Semen Viscosity Impact on Fertility
High viscosity (thick, dense semen) can impede sperm motility. Viscosity is categorized as thin, normal, slight, moderate, or extreme, with extreme levels posing significant challenges for sperm progression.
Abnormal Semen Color and Health Indicators
Reddish semen (hematospermia) may signal blood in the sample, while a greenish tint could indicate infection. White or yellowish hues are typically normal, but persistent changes warrant further evaluation.
Sperm Agglutination and Fertility Challenges
Agglutination (sperm clumping) is graded as none, slight, moderate, or severe. Severe clumping hinders sperm from reaching the egg, directly impacting fertilization success.
Semen pH Levels and Seminal Vesicle Function
A normal pH (≥7.2) reflects healthy seminal vesicle function. Acidic pH (<7.2) often correlates with low ejaculate volume and impaired sperm nutrient support, affecting overall fertility.
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