welche blutwerte bei erschöpfung und müdigkeit — what are common causes?

The provided knowledge does not contain a comprehensive list of blood values for exhaustion and fatigue. The snippets mention vitamin D insufficiency and low ferritin (iron deficiency) as possible contributors, but do not cover other common markers like thyroid hormones, B12, or inflammation. The context also stresses that DTC tests are not diagnostic and cannot replace medical evaluation. Given the limited and indirect information, the evidence level is 'unclear'. For a thorough workup, a doctor should be consulted.