An automated CBC produced the following parameters: ParameterValueReference IntervalWhite blood cells (WBC)5.6 x 109/L4.0-10.0 x 109/LRed blood cells (RBC)3.4 x 1012/L4.2-5.9 x 1012/LHemoglobin11.1 g/dL12-16 g/dLHematocrit31%37-48%MCV92 fL80-100 fLMCHC 38 g/dL30-37 g/dL A specimen for a repeat CBC is received in the laboratory six hours later. The sample visually appears to be much lighter in colo

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An automated CBC produced the following parameters:

Parameter
Value
Reference Interval
White blood cells (WBC)
5.6 x 109/L
4.0-10.0 x 109/L
Red blood cells (RBC)
3.4 x 1012/L
4.2-5.9 x 1012/L
Hemoglobin
11.1 g/dL
12-16 g/dL
Hematocrit
31%
37-48%
MCV
92 fL
80-100 fL
MCHC
 38 g/dL
30-37 g/dL

A specimen for a repeat CBC is received in the laboratory six hours later. The sample visually appears to be much lighter in color than the original sample. The technologist questions whether both samples are from the same patient. Which of the following parameter(s) is LEAST likely to change between samples, if from the same patient, and would be most useful to determine if there is a discrepancy that may be the result of a preanalytical error in sample collection?

Please select the single best answer