Observation of sperm-head vacuoles and sperm morphology under light microscope

Objective: The presence of sperm-head vacuoles has been suspected to be deleterious to the outcomes of assisted reproductive technology (ART). It is difficult to accurately distinguish morphologically abnormal sperm with vacuoles under a light microscope. This study was per-formed to analyze the result of the observation of sperm-head vacuoles using Papanicolaou staining under a light microscope and whether the male partner’s age affects these vacuoles. Methods: Sperm morphology with vacuoles was evaluated using Papanicolaou staining and observed under a light microscope (400 × ) in 980 men. The normal morphology was divided into three categories (group A, < 4 % of normal morphology; group B, 4%–14 % of normal morphol-ogy; and group C,> 14 % of normal morphology). The criteria for the sperm-head vacuoles were those given in the World Health Organization manual. For the analysis of the age factor, the participants were divided into the following groups: 26–30 years, 31–35 years, 36–40 years, 41– 45 years, and 46–50 years. Results: The percentage of sperm-head vacuoles increased with normal sperm morphology (group A vs. groups B, C) (p< 0.05). In the case of the age factor, a statistically significant difference was not observed across any of the age groups. Conclusion: A majority of the sperm-head vacuoles showed a statistically significant difference among normal morphology groups. Therefore, we should consider the probability of the percentage of sperm-head vacuoles not increasing with age but with abnormal sperm morphology. A further study is required to clarify the effect of the sperm-head vacuoles on ART outcomes