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Author Question: Which of the following red cell indices support normocytic normochromic red cell morphology? MCV ... (Read 29 times)

chandani

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on: Jun 25, 2018
Which of the following red cell indices support normocytic normochromic red cell morphology?
 
  MCV (fL) MCH (pg) MCHC (g/dL)
 
  a. 120 36 35
  b. 68 22 28
  c. 90 30 34
  d. 75 30 34

Question 2

Any of the following could be an explanation for the invalid hemoglobin for Mary Jones (Questions 13 through
 
  a. The blood sample is hemolyzed.
  b. Lipemia is present in the plasma.
  c. The patient has hemoglobin S (Hb S).
  d. The patient's white count is 150.0  109/L.


amanda_14

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: C
Because the red cells are both normal in size and normal in hemoglobin concentration, all the red cell indices must be in the reference range.

Answer to Question 2

ANS: A
If red cells have been hemolyzed in the blood sample, then it will have no effect on a manual hemoglobin because red cells are lysed to determine the hemoglobin. However, the red count will be falsely low. Lipemia, Hb S in which cells are more resistant to lysis, and a high white count all add turbidity to the hemoglobin dilution. This increases the optical density (decreases percent transmittance) and falsely elevates the hemoglobin calculation.


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