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Test Code HCT Hematocrit

Additional Codes

Cerner

NextGen

Hematocrit

Hematocrit

HCT

 

Alternate Name(s)

HCT

Patient Preparation

None

Collection Instructions

Do not place samples on a mechanical rocker.

Specimen Requirements

Preferred Volume

12 x 75 mm tube EDTA-2K or EDTA-3K Lavender filled to capacity

Minimum Volume

  • 1mL of whole blood in 12 x 75 mm tube EDTA-2K or EDTA-3K Lavender
  • 160 μL of whole blood in microtube EDTA-2K or EDTA-3K Lavender

Container

  • 12 x 75 mm tube EDTA-2K or EDTA-3K Lavender

  • Microtube EDTA-2K or EDTA-3K Lavender

Stability

  • Sample stability at room temperature is 24 hours.
  • Stored at 2-8oC, EDTA blood samples with normal results may be analyzed up to 48 hours

Rejection Criteria

  • Clotted samples or those containing clots, fibrin strands, or platelet clumps.  All specimens will be checked visually for obvious clots prior to sampling by the analyzer.
  • Grossly hemolyzed samples.
  • Samples drawn above an IV line.

Result Reporting and Reference Values

Reference Ranges

Units

Sex

Age

Reference Range

vol%

All

0D-15D

36

--

64

All

15D-30D

31

--

55

M

30D-60D

31

--

56

F

30D-60D

30

--

56

All

60D-90D

28

--

49

All

90D-1Y

30

--

49

All

1Y-7Y

30

--

40

All

7Y-15Y

33

--

44

M

15Y-150Y

40

--

52

F

15Y-150Y

35

--

46

 

Critical Ranges

Units

Sex

Age

Critical

vol%

All

0D-15D

<18

>65

15D-150Y

<18

>58

Reflex Testing

None

Limitations

WBC's greater than 100,000/µL may cause turbidity and falsely increase HCT value.

Useful For/ Methodology

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