wieviel gene hat ein mensch — which blood markers matter?

Humans have approximately 20,000–25,000 protein-coding genes, plus thousands of non-coding RNA genes. When it comes to actionable health insights, blood markers such as LDL/HDL cholesterol, fasting glucose, HbA1c, hs-CRP, vitamin D, ferritin, and TSH are clinically validated and directly reflect your current metabolic and inflammatory state. DNA tests can only indicate genetic predispositions, which often have small and inconsistent effects on actual blood levels. For meaningful health decisions, regular blood testing is far more reliable than genetic testing alone. The evidence for these blood markers is strong (human-strong), whereas many DNA-based claims for 'blood marker genes' have only moderate or unclear support.