Semen analysis is a crucial test for evaluating male fertility and is vital for diagnosing and treating male infertility. So, how long should one abstain before a semen test?
Experts indicate that abstinence for 2 to 7 days is generally required for semen testing. Prolonged abstinence can affect the measurement of semen parameters, primarily impacting sperm motility.
Experts state that within one hour after ejaculation, over half of the sperm should be motile. If motile sperm are less than half, it is considered abnormal, termed asthenospermia or low sperm motility. If sperm are completely immotile, it is diagnosed as necrospermia. Low sperm motility and necrospermia are major causes of male infertility.
Analysis of key semen parameters—such as concentration, motility, and morphology—must be integrated with the patient's medical history. Relying solely on laboratory results without considering the medical background is extremely naive and constitutes an irresponsible approach to patient care. This is because: First, semen analysis is not a functional test; it merely provides a rough assessment of fertility potential based on sperm concentration, motility, and morphology. This is akin to judging a book by its cover and is inherently flawed.Second, routine semen analysis cannot determine the fertilization capacity of the few sperm that reach the fertilization site. Therefore, accurately assessing male fertility requires a comprehensive evaluation incorporating clinical data such as medical history.
The definition of male infertility does not specify any particular semen parameters. Routine semen analysis serves only as a reference for evaluating male fertility and has many limitations; it must be interpreted in conjunction with medical history. Medical history primarily refers to the duration of unprotected intercourse.Clinically, we observe that many patients with hypogonadotropic male infertility achieve pregnancy after treatment when their semen contains a small number of sperm, underscoring the importance of medical history. If a history exists and the male's semen analysis parameters are normal while the female has no major issues, it suggests potentially unknown infertility factors that may be more challenging to treat.During ejaculation, the initial discharge is clear and viscous, primarily consisting of bulbourethral gland secretions and a small amount of prostatic fluid. This serves as a marker of male sexual arousal, contains very few sperm, and functions to lubricate the urethra for easier ejaculation. The main body of semen follows, predominantly composed of prostatic fluid and epididymal tail fluid. This portion contains the highest quantity and best quality of sperm, initially coagulating and later liquefying.Finally, the seminal vesicle secretion, rich in fructose, contains fewer sperm of poorer quality. If collection is incomplete, retesting is required for reliable results. Inadequate mixing of the sample by the laboratory may also compromise semen analysis outcomes.