Insufficient centrifugation will result in:
A. A false increase in Hematocrit (Hct) value
B. A false decrease in Hct value
C. No effect on Hct value
D. All of these options, depending on the patient
A. A false increase in Hematocrit (Hct) value
Variation in red cell size observed on the...
Insufficient centrifugation will result in:
A. A false increase in Hematocrit (Hct) value
B. A false decrease in Hct value
C. No effect on Hct value
D. All of these options, depending on the patient - ANSWER- A. A false increase
in Hematocrit (Hct) value
Variation in red cell size observed on the peripheral smear is described as:
A. Anisocytosis
B. Hypochromia
C. Poikilocytosis
D. Pleocytosis - ANSWER- A. Anisocytosis
Which of the following is the preferable site for bone marrow aspiration and
biopsy in an adult?
A. Iliac crest
B. Sternum
C. Tibia
D. Spinous process of a vertebra - ANSWER- A. Iliac crest
Mean Cell Volume (MCV) is calculated using the following formula:
A. (Hgb/RBC) x 10
B. (Hct/RBC) x 10
C. (Hct/Hgb) x 100
D. (Hgb/RBC) x 100 - ANSWER- B. (Hct/RBC) x 10
what term describes the change in shape of erythrocytes seen on a Wright's-
stained peripheral blood smear?
A. Poikilocytosis
B. Anisocytosis
,C. Hypochromia
D. polychromasia - ANSWER- A. Poikilocytosis
Calculate the mean cell hemoglobin concentration (MCHC) using the following
values:
Hgb: 15 g/dL (150 g/L), Hct: 47mL/dL (0.47),
RBC: 4.50 x10^6/uL (4.50 x 10^12/L)
A. 9.5% (0.095)
B. 10.4% (0.104)
C. 31.9% (0.319)
D. 33.3% (0.333) - ANSWER- C. 31.9% (0.319)
MCHC= (Hgb/Hct) x 100
A manual WBC count was performed. A total of 36 cells were counted in all 9-
mm^2 of a Neubauer-ruled hemacytometer. A 1:10 dilution was used. What is the
WBC count?
A. 0.4 x 10^9/L
B. 2.5 x 10^9/L
C. 4.0 x 10^9/L
D. 8.0 x 10^9/L - ANSWER- A. 0.4 x 10^9/L
Number of cells counted x dilution factor x depth factor (10), then divided by the
area (9-mm^2)= WBC count
When an erythrocyte containing iron granules is stained with Prussian blue, the
cell is called a:
A. spherocyte
B. leptocyte
C. schistocyte
D. siderocyte - ANSWER- D. siderocyte
A 7.0-mL ethylenediaminetetraacetic acid (EDTA) tube is received in the
laboratory containing only 2.0mL of blood. If the Laboratory is using manual
techniques, which of the following tests will most likely be erroneous?
A. RBC count
B. Hemoglobin (Hgb)
C. Hct
D. WBC count - ANSWER- C. Hct (hematocrit)
a 1:200 dilution of a patient's sample was made and 336 RBC's were counted in a
area of 0.2mm^2. What is the RBC count?
A. 1.68 x 10^12/L
, B. 3.36 x 10^12/L
C. 4.47 x 10^12/L
D. 6.66 x 10^12/L - ANSWER- B. 3.36 x 10^12/L
RBC count= number of cells counted x dilution factor x depth factor (10), then
divided by the area
What phagocytic cells produce lysozymes that are bacteriocidal?
A. Eosinophils
B. Lymphocytes
C. Platelets
D. Neutrophils - ANSWER- D. Neutrophils
If a patient has a reticulocyte count of 7% and a Hct of 20%, what is the corrected
reticulocyte count?
A. 1.4%
B. 3.1%
C. 3.5%
D. 14% - ANSWER- B. 3.1%
Corrected retic count= reticulocytes (%) x Hct/45(avg norm hct)
A decreased osmotic fragility test would be associated with which of the
following conditions?
A. Sickle cell anemia
B. Hereditary Spherocytosis
C. Hemolytic disease of the newborn
D. Acquired hemolytic anemia - ANSWER- A. Sickle cell anemia
What effect would using a buffer at pH 6.0 have on a Wright's-stained smear
A. Red cells would be stained too pink
B. White cell cytoplasm would stain too blue
C. Red cells would be stained too blue
D. Red cells would lyse on the slide - ANSWER- A. Red cells would be stained too
pink
Which of the following erythrocyte inclusions can be visualized with supravital
stain but cannot be detected on a Wright's-stained blood smear?
A. Basophilic stippling
B. Heinz bodies
C. Howell-Jolly bodies
D. Siderotic granules - ANSWER- B. Heinz bodies
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