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Hematocrit: What Your Red Blood Cell Percentage Means
All NiaHealth tests are processed in Canadian-certified labs, which are highly trusted by the medical community for their accuracy and reliability. Blood and urine samples are collected by licensed medical professionals and processed using state-of-the-art equipment. NiaHealth is SOC2 Type 2 certified.
What is it?
Hematocrit measures the percentage of your blood that is made up of red blood cells.
For example, a hematocrit of 0.40 (or 40%) means that 40% of your blood volume consists of red blood cells. Because red blood cells carry oxygen, hematocrit reflects how concentrated your red cells are in your bloodstream.
Why it matters
Hematocrit helps to determine whether the concentration of red blood cells in your blood is appropriate.
This marker is used together with hemoglobin and other red blood cell markers to evaluate oxygen-carrying capacity and to investigate possible anemia or elevated red cell levels.
Because hematocrit reflects both red blood cell mass and plasma volume, it also provides insight into hydration status and overall blood concentration.
Reference ranges
- Below range: May suggest anemia or dilution of the blood (for example from increased fluid volume). Further evaluation helps determine the cause.
- In range: Red blood cell concentration is within expected limits for your sex.
- Above range: May reflect dehydration, reduced plasma volume, or increased red blood cell production. Persistently high levels may require further assessment.
Billett, H. H. (1990). Hemoglobin and hematocrit. In Clinical Methods: The History, Physical, and Laboratory Examinations. Butterworths.
Mondal, H., & Zubair, M. (2025). Hematocrit. In StatPearls. StatPearls Publishing.
This information is educational and does not replace medical advice, diagnosis, or treatment. Your results should be interpreted with a qualified healthcare professional in the context of your health history.
