[1]
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MedlinePlus: Hematocrit test
Official patient guide explaining high hematocrit, factors that can affect it, and why an abnormal result needs medical context.
What does high hematocrit mean in a blood test?
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High hematocrit means the percentage of blood made up of red blood cells is above the lab's reference range. Dehydration is a common reason, while high altitude, smoking, heart or lung problems, or blood conditions can also contribute. One result cannot diagnose the cause, so ask a clinician to review hydration, symptoms, the rest of the CBC, history, and trends.
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[2]
High trust
MedlinePlus Medical Encyclopedia: Hematocrit
Patient education on possible reasons for a high hematocrit, including dehydration, smoking, low oxygen, and some heart, lung, or blood conditions.
[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.
Not medical advice.
Use this page for source review, not diagnosis, treatment, medication changes, or emergency triage.