Nährstoffcheck: which blood markers matter?

A nutrient check via blood markers can help identify deficiencies early. Key markers include: 25-hydroxyvitamin D (vitamin D status), vitamin B12 (holotranscobalamin or total B12), ferritin (iron stores), serum magnesium (a rough indicator only), zinc, folate (RBC folate), calcium (mainly relevant in kidney or bone disease), and homocysteine (a functional marker for B vitamins). HbA1c and blood lipids may also indicate metabolic issues. Important limitations: serum magnesium poorly reflects total body magnesium; zinc levels can be influenced by inflammation. Interpretation should always be done by a physician in clinical context. MyBody-X offers nutrient tests, but blood collection and analysis should follow standardized lab methods. Evidence is strong for vitamin D, B12, and ferritin (human-strong), moderate for zinc and magnesium (human-moderate). No test replaces medical diagnosis.