[1]
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MedlinePlus: Hemoglobin test
Official patient guide explaining high hemoglobin, factors that can affect it, and why an abnormal result needs medical context.
What does high hemoglobin mean in a blood test?
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High hemoglobin means the oxygen-carrying protein in the blood is above the lab's reference range. It can occur with dehydration, smoking, high altitude, sleep apnea, lung or heart disease, or some blood conditions, but one result cannot diagnose the cause. Ask a clinician to review it with symptoms, hydration, the rest of the CBC, history, and trends.
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[2]
High trust
MedlinePlus Medical Encyclopedia: Polycythemia vera
Patient education on one uncommon blood condition a clinician may consider after confirming persistently high red blood cell measurements.
[3]
High trust
MedlinePlus: How to understand your lab results
Plain-language guide to reference ranges, abnormal flags, and why results should be interpreted with a clinician.
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Use this page for source review, not diagnosis, treatment, medication changes, or emergency triage.