was heißt hb — what does this mean exactly?

The abbreviation 'hb' almost always stands for **hemoglobin** in medical and laboratory contexts – an iron-containing protein in red blood cells that carries oxygen from the lungs to the tissues. In a complete blood count, Hb is reported in g/dL or mmol/L; normal ranges are roughly 13.5–17.5 g/dL for men and 12.0–16.0 g/dL for women. Low Hb indicates anemia; high Hb may suggest polycythemia or dehydration. In genetics, 'HB' can refer to hemoglobin genes (e.g., HBB, HBA1) involved in hereditary anemias like sickle cell disease or thalassemia. However, consumer DNA tests typically do not screen for pathogenic hemoglobin variants – that requires clinical diagnostic testing. Interpreting an Hb value always needs clinical context; a single number without history or other labs is insufficient. Evidence: practice (standard medical knowledge).