Semen characteristics in pubertal boys. I. Semen quality after first ejaculation

Area of Science:

• Reproductive Biology
• Andrology
• Human Physiology

Background:

• Semen analysis is crucial for assessing male reproductive health.
• Pubertal development involves significant physiological changes impacting semen parameters.

Purpose of the Study:

• To investigate the relationship between time since first ejaculation and semen quality in pubertal boys.
• To establish a timeline for the maturation of semen parameters.

Main Methods:

• Analysis of 274 semen assays from 134 pubertal boys.
• Statistical evaluation of semen volume, liquefaction, sperm concentration, morphology, and motility in relation to time post-first ejaculation.

Main Results:

• Semen volume, liquefaction, sperm concentration, and morphology normalize 12-14 months after first ejaculation.
• Normal sperm motility is observed 21-23 months post-ejaculation.
• Semen quality progresses through stages: azoospermia, oligozoospermia, asthenozoospermia, to normospermia.

Conclusions:

• Semen quality undergoes a distinct maturation process following the first ejaculation in pubertal males.
• Understanding this timeline is essential for interpreting semen analysis results in adolescents.