Chapter 14 - Manual, Semiautomated, and Point-of-Care Testing in Hematology

Question 1

A 1:20 dilution of blood is made with 3% glacial acetic acid as the diluent. The four large corner squares on both sides of the hemacytometer are counted, for a total of 100 cells.
What is the total WBC count (3109/L)?

Answer 1

b. 2.5

Question 2

The total WBC count is 20 3 109/L. Twenty-five NRBCs per 100 WBCs are observed on the peripheral blood film. What is the corrected WBC count (3109/L)?

Answer 2

c. 16

Question 3

If potassium cyanide and potassium ferricyanide are used in the manual method for hemoglobin determination, the final product is:

Answer 3

c. Cyanmethemoglobin

Question 4

Which of the following would not interfere with the result when hemoglobin determination is performed by the cyanmethemoglobin method?

Answer 4

d. Fetal hemoglobin

Question 5

A patient has a hemoglobin level of 8.0 g/dL. According to the rule of three, what is the expected range for the hematocrit?

Answer 5

d. 21% to 27%

Question 6

Calculate the MCV and MCHC for the following values:
RBCs = 5.00 x 10^12/L
HGB = 9 g/dL
HCT = 30%

Answer 6

b. MCV (fL) = 60
MCHC (g/dL) = 30

Question 7

What does the reticulocyte count assess?

Answer 7

c. Erythropoietic activity of the bone marrow

Question 8

For a patient with the following test results, which measure of bone marrow red blood cell production provides the most accurate information?
Observed reticulocyte count = 5.3%
HCT = 35%
Morphology—moderate polychromasia

Answer 8

c. RPI

Question 9

Given the following values, calculate the RPI:
Observed reticulocyte count = 6%
HCT = 30%

Answer 9

a. 2

Question 10

Which of the following would be associated with an elevated ESR value?

Answer 10

d. Inflammation