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Complete Blood Count (CBC)

Hematocrit (Hct)

Normal range 36-52 % (0.36-0.52 proportion of 1.0 SI). Specimen: Whole blood (EDTA).

Also known as: packed cell volume, PCV.

36-52 %Critical value: read below

Reference range

Conventional%
3652
SIproportion of 1.0
0.360.52

Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Hematocrit (Hct); those can be narrower than the band shown.

Hematocrit (Hct) reference range, specimen, and conversion details
SpecimenWhole blood (EDTA)
Conventional range36-52 %
SI range0.36-0.52 proportion of 1.0
Conversion factor×0.01 (conventional → SI)
Critical value< 20% or > 60%
PanelComplete Blood Count (CBC)

Convert any Hematocrit (Hct) result between units on the unit converter.

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).

What is a critical Hematocrit (Hct) value?

For Hematocrit (Hct), the commonly taught critical (panic) value is: < 20% or > 60%. Critical results are reported to the provider immediately under your facility's policy.

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.

At the bedside

Nursing considerations

  • Roughly three times the hemoglobin in g/dL.
  • Falsely elevated with dehydration; recheck after volume resuscitation.
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