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Test Code HCRT Hematocrit (Hct), Blood, LAB289

Important Note

If you want both a hemoglobin and hematocrit, please order LAB753.

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

Container/Tube: Lavender-top (EDTA) tube

Specimen: Whole blood anticoagulated with EDTA is preferred.  A minimum draw of 1 mL is required for sampler analysis in a 5 mL EDTA tube (evacuated to draw 2.5 mL) to minimize the dilution effect of excess liquid anti-coagulant.  An EDTA microtainer filled above the 250 mL line is adequate for testing in the open mode.

Transport:  Room temperature to arrive within 24 hours

Reference Values

Males

0-14 days: 50.0-65.0%

15-29 days: 45.0-60.0%

1-2 months: 42.0-54.0%

3-11 months: 37.0-52.0%

12-23 months: 34.0-50.0%

2-13 years: 32.0-48.0%

≥14 years: 40.0-52.0%
 

Critical values

0-14 days: <30.0% or >70.0%

15-30 days: <24.0% or >70.0%
>30 days: <21.0% or >60.0%

 

Females

0-14 days: 50.0-65.0%

15-29 days: 45.0-60.0%

1-2 months: 42.0-54.0%

3-11 months: 37.0-52.0%

12-23 months: 34.0-50.0%

2-13 years: 32.0-48.0%

≥14 years: 35.0-47.0%
 

Critical values

0-14 days: <30.0% or >70.0%

15-30 days: <24.0% or >70.0%
>30 days: <21.0% or >60.0%

Day(s) Test Set Up

Monday through Sunday

Methodology

Hematocrit (HCT) is measured as a ratio of the total RBC volume to whole blood using cumulative pulse height detection.

Test Classification and CPT Coding

85014