Overview
Semen examination is a fundamental laboratory investigation used to assess male reproductive health and fertility. Semen is an admixture of spermatozoa suspended in secretions from the testis and epididymis, which are mixed at the time of ejaculation with secretions from the prostate, seminal vesicles, and bulbourethral glands. The final ejaculate is a viscous fluid whose physical characteristics reflect the functional status of these organs.
Semen analysis is performed for infertility evaluation, post-vasectomy assessment, medico-legal purposes, donor selection, and assisted reproductive technology planning. Proper collection, handling, and timely examination are essential to obtain reliable results.
Symptoms
Abnormal semen parameters do not usually produce direct symptoms but are associated with underlying reproductive or systemic conditions. Men may present clinically with infertility, reduced fertility potential, or a history of unsuccessful conception. Associated findings may include a history of ejaculatory issues, low semen volume, abnormal colour or consistency of semen, or past infections affecting the reproductive tract. In some cases, semen abnormalities are detected incidentally during routine fertility evaluation without any overt symptoms.
Causes
Abnormal semen findings may be caused by defects in sperm production, transport, or accessory gland function. Incomplete liquefaction can result from prostatic or seminal vesicle dysfunction. Low semen volume may be due to hypospermia, ejaculatory duct obstruction, congenital absence of vas deferens, incomplete sample collection, retrograde ejaculation, or hypogonadism. Abnormal colour, such as yellow or red discoloration, may indicate infection, inflammation, jaundice, hematospermia, trauma, or malignancy. Increased viscosity can impair sperm motility and fertilizing capacity, while altered pH reflects prostatic or seminal vesicle pathology or infection.
Risk Factors
Risk factors affecting semen quality include prolonged or inadequate sexual abstinence, fever, systemic illness, alcohol abuse, drug intake, infections of the male genital tract, and hormonal disorders. Improper sample collection, loss of part of the ejaculate, delayed transport to the laboratory, and use of inappropriate containers can significantly alter results. Surgical procedures such as vasectomy or prostate biopsy, and congenital anomalies of the reproductive tract, also increase the risk of abnormal semen parameters.
Prevention
Prevention of inaccurate semen analysis results depends on strict adherence to proper collection and handling guidelines. Maintaining a sexual abstinence period of at least 48 hours but not more than 7 days before collection is essential. The entire sample should be collected in a clean, non-toxic, wide-mouthed container and delivered to the laboratory within one hour of ejaculation. Avoiding alcohol abuse, managing infections promptly, and helping a complete clinical history ensure accurate interpretation. Proper patient education and standardized laboratory procedures reduce errors and improve the reliability of semen examination results.
