welche blutwerte bei müdigkeit und erschöpfung — what does this mean exactly?

The question 'which blood values for fatigue and exhaustion' targets a common clinical workup. Standard labs include complete blood count (CBC with MCV, MCH), ferritin, vitamin B12, folate, TSH, vitamin D, and inflammatory markers (CRP). The provided context highlights that B12 and folate assessment is often incomplete: methylmalonic acid (MMA) and homocysteine are more sensitive than serum B12 alone (PMID:15018392). FUT2 secretor status can also affect B12 levels – non-secretors tend to have lower values. Celiac disease (tTG-IgA) is frequently overlooked yet can cause fatigue via malabsorption. Important caveat: at-home tests for B12 or celiac often measure only one marker and omit total IgA or MMA, risking false negatives. Evidence for these markers is human-moderate to practice-based. A physician should interpret results in clinical context, as fatigue is multifactorial (sleep, stress, infections, nutrients).