Human sperm head morphometric distribution and its influence on human fertility

Area of Science:

• Reproductive biology
• Andrology
• Sperm analysis

Background:

• Sperm morphology is a key factor in male fertility.
• Variations in sperm head size may impact fertilization success.
• Predictive markers for fertility are crucial for assisted reproductive technologies.

Purpose of the Study:

• To investigate the relationship between live sperm head size distribution and fertility outcomes.
• To determine if sperm head size uniformity can predict successful in vitro fertilization (IVF).
• To assess sperm head morphometrics as a predictor of natural conception.

Main Methods:

• A prospective blind clinical trial was conducted with 155 patients undergoing IVF.
• Morphometric analysis of sperm head area, major axis, minor axis, and elongation ratio was performed using a Hamilton-Thorne analyzer.
• Logistic regression models were developed to predict fertilization probability.

Main Results:

• Fertilization was achieved in 74% of patients.
• Patients who achieved fertilization showed a significantly smaller interquartile range of sperm head area and major axis compared to non-fertilizers.
• Men who had fathered a child naturally exhibited more uniform sperm head area in semen.

Conclusions:

• A more uniform sperm head area in semen and preparations is associated with successful IVF.
• Sperm head size uniformity is a potential predictor of a history of fathering a child.
• Sperm morphometrics offer valuable insights into male fertility potential.