wie kann ich cortisol messen — can a microbiome test help?

Cortisol is measured via blood, saliva, or urine – not through a microbiome test. Blood and saliva tests (e.g., morning cortisol, diurnal profile) are clinically established, as is the 24h urinary free cortisol test for diagnosing Cushing's syndrome. A microbiome test can only provide indirect clues about the gut-brain axis or the influence of gut bacteria on cortisol metabolism, but it does not measure cortisol itself. The evidence for such connections is mostly mechanistic or from animal models; robust clinical studies showing a direct correlation between specific bacteria and human cortisol levels are lacking. If you want a reliable cortisol measurement, consult a doctor for a validated lab test. MyBody-X does not offer a cortisol test; its existing products (e.g., vitamin D test, nutrient deficiency test) are intended as screening hints, not medical diagnostics. A standalone microbiome test for cortisol measurement is therefore not useful.