What role does Testosteron Test play in fertility?

A standalone testosterone test, as often marketed by direct-to-consumer companies, is insufficient for fertility assessment. While testosterone is crucial for sperm production, male infertility has many causes: genetic factors (e.g., Y-chromosome microdeletions), hormonal imbalances (FSH, LH, prolactin), and obstructive or inflammatory issues. A single testosterone value can be misleading due to diurnal variation and lack of free testosterone measurement. Medical guidelines (e.g., EAU, ASRM) recommend a comprehensive andrology workup including semen analysis and full hormone panel. The evidence for isolated testosterone tests is therefore rated as 'marketing/unclear'. Consumers should not rely on such quick tests but seek medical evaluation.