Case Study: Laboratory test results

Ungraded Practice Question

The CBC results in this case break the rule of threes. What is the rule of threes?

Please select the single best answer

All abnormal cell counts should be repeated two more times to verify the results.
The RBC count is generally three times greater than the hemoglobin.
If red blood cells are normochromic and normocytic, the RBC count times 3 will approximate the Hb and the hemoglobin times 3 will approximate the HCT.
The indicies, MCV, MCH, and MCHC all reflect the same direction of results (normal, increased, or decreased)

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