Lay opinion vs evidence: Blutbild Frauen

A complete blood count (CBC) in women is surrounded by lay opinions: e.g., that a low ferritin always means iron deficiency, or that any deviation from the reference range is pathological. Evidence shows: a CBC provides essential baseline values (hemoglobin, red cells, white cells, platelets) that can indicate anemia, infection, or clotting disorders. A differential adds white cell subtypes. In women, reference ranges for hemoglobin and ferritin are physiologically lower than in men (due to menstruation, pregnancy). An isolated low ferritin without anemia is not equivalent to iron deficiency – storage iron can be low in healthy women. The claim that a 'normal' CBC always means health is false: many conditions (e.g., early kidney disease, thyroid disorders) only show in specific lab markers. Interpretation must be clinical. Lay opinions tend to overinterpret single values; evidence-based medicine emphasizes the full picture. Caveat: self-tests without medical evaluation can cause unnecessary anxiety or false reassurance.