Blood, Anemia & Hematology
Published on 10 September 2026
What level of hemoglobin is dangerously high?
A hemoglobin level above 18.5 g/dL in men or 16.5 g/dL in women is generally considered dangerously high. This condition, called polycythemia, thickens the blood and raises the risk of clots, strokes, or heart problems. Causes range from smoking and dehydration to lung disease or bone marrow disorders. High readings should always be discussed with a doctor to find the underlying cause.
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