Evidence check: Testosteron Test in the context of longevity

Testosterone testing for longevity is controversial. While levels decline with age and low testosterone is linked to reduced muscle mass, bone density, and libido, robust evidence that routine testing in healthy older men extends lifespan is lacking. Most data come from observational studies; randomized trials of supplementation show mixed results and potential cardiovascular risks. Additionally, testosterone is an acute-phase reactant – inflammation (e.g., elevated CRP or ferritin) can lower measured levels, complicating interpretation. Testing may be justified when hypogonadism symptoms are present, but not as a standalone longevity biomarker. Over-testing can lead to unnecessary hormone therapy with unclear long-term benefits. Evidence: mixed (observational, mechanistic; no strong longevity RCTs). Sources: none directly from provided context; general Endocrine Society guidelines.