Biomarker education
Hematocrit: What It Measures & Why People Track It
Also called: Hct, Packed cell volume
Hematocrit is the percentage of blood volume made up of red blood cells, part of a CBC.
General biomarker education — not personalized medical advice. Learn more
Result on your report
IllustrativeHematocrit
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Range: Low – High
LowReference intervalHigh
What it generally measures
Labs calculate or measure the proportion of your blood sample occupied by red blood cells.
Common units on reports: %
Why people track it over time
Hematocrit generally moves together with hemoglobin and RBC count, and is reviewed alongside them rather than alone.
Changes over time do not by themselves establish a diagnosis. Learn more
Questions you might ask a healthcare professional
Questions to bring
IllustrativeAsk how hematocrit compares with hemoglobin and RBC on the same panel.
Ask whether hydration at the time of the draw could affect this result.
Related markers
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