Above the range
Common causes of a high Hematocrit (Hct)
- Dehydration
- Polycythemia
- Chronic hypoxia
- Burns (hemoconcentration)
Looking for the other direction? See what causes a low Hematocrit (Hct).
All tests · Complete Blood Count (CBC) · Hematocrit (Hct)
Above the range
What causes a high Hematocrit (Hct)?
Normal range 36-52 % (0.36-0.52 proportion of 1.0 SI). Specimen: Whole blood (EDTA). See the full Hematocrit (Hct) reference page for critical values and nursing considerations.
What is the normal range for Hematocrit (Hct)?
The standard teaching reference range for Hematocrit (Hct) is 36-52 % in conventional units, or 0.36-0.52 proportion of 1.0 in SI units. This value is measured in whole blood (edta).
| Specimen | Whole blood (EDTA) |
|---|---|
| Conventional range | 36-52 % |
| SI range | 0.36-0.52 proportion of 1.0 |
| Critical value | < 20% or > 60% |
| Panel | Complete Blood Count (CBC) |
Full details, including nursing considerations, on the Hematocrit (Hct) normal range page. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
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