was ist ein normaler hb wert — what are common causes?

Normal hemoglobin (Hb) levels depend on age, sex, and laboratory reference ranges. For adult men, typical values are 13.5–17.5 g/dL; for women, 12.0–15.5 g/dL. Lower thresholds apply during pregnancy and childhood. Common causes of low Hb (anemia) include iron deficiency, chronic disease, blood loss, vitamin B12/folate deficiency, hemolysis, or bone marrow disorders. High Hb (polycythemia) can result from dehydration, smoking, chronic lung disease, sleep apnea, living at high altitude, or primary polycythemia vera. Note: a single abnormal value is not diagnostic. Clinical workup with additional parameters (RBC indices, ferritin, B12, CRP) is essential. Consumer DNA tests for Hb-related genes (e.g., HFE for hemochromatosis, HBB for sickle cell) provide risk hints only, not diagnoses. Their clinical utility is limited without medical context. Always consult a physician for interpretation and further testing if Hb is outside the normal range.