welche blutwerte bei erschöpfung — what are common causes?

Exhaustion (fatigue) has many causes – from sleep deprivation and stress to underlying medical conditions. Common blood markers for evaluation include: complete blood count (anemia?), ferritin (iron stores), vitamin B12, folate, vitamin D, TSH (thyroid), CRP (inflammation), fasting glucose, and electrolytes. A DNA test for 'fatigue genes' (e.g., FTO, TCF7L2) is not indicated – these variants have tiny effects and are not diagnostic. Microbiome tests also do not provide a direct fatigue diagnosis. Important: blood values are screening tools, not definitive diagnoses. For persistent fatigue, always seek medical evaluation (including psychological factors). Evidence for the listed lab parameters is strong (clinical practice), but individual reference ranges may vary. Do not self-treat without a doctor.