welche blutwerte sind wichtig bei müdigkeit — can a microbiome test help?

For persistent fatigue, standard blood tests are essential: iron/ferritin (iron deficiency anemia), vitamin B12, folate, vitamin D, thyroid markers (TSH, fT3, fT4), inflammatory markers (CRP), and blood glucose (fasting glucose, HbA1c). A complete blood count can also detect anemia or infection. These are well-established (human-strong evidence). As for microbiome testing: current evidence does not support routine stool analysis for fatigue. While the gut microbiota influences energy metabolism (e.g., short-chain fatty acids, B-vitamin synthesis), no clinical trials show that microbiome-guided interventions reliably improve fatigue. Consumer tests lack standardization and clinical validation. Therefore, prioritize blood work first; microbiome testing remains experimental and should be interpreted cautiously.