HEMATOLOGY EXAM ACTUAL
QUESTIONS AND CORRECT ANSWERS
Blood collected in EDTA undergoes which of the following changes if kept at room
temperature for 6-24 hours? - CORRECT ANSWERS✅✅a. Increased hematocrit and MCV
To remove fresh blood from a lab coat you would: - CORRECT ANSWERS✅✅c. Apply a
3% hydrogen peroxide solution then rinse thoroughly with water
Which of the following achromatic objectives would be an oil immersion objective: -
CORRECT ANSWERS✅✅c. N.A. 1.25
A blood smear from an infant was examined and it was discovered that there were 20
nucleated erythrocytes for each 100 leukocytes counted. The observed WBC count as 3.6 x
109/L. What is the corrected (true) leukocyte count? - CORRECT ANSWERS✅✅b. 3.00 x
109/L
The diluent used for counting platelets by the Unopette method is: - CORRECT
ANSWERS✅✅c. 1% ammonium oxalate
The principle of counting the cells using anoptical cell counter is: - CORRECT
ANSWERS✅✅c. based on the scattering of light by cells
When a red blood cell count is performed on an electrical particle counter, the counter usually
- CORRECT ANSWERS✅✅b. includes white blood cells
Cells are counted on the Coulter Counter as they pass through a path between two electrodes
by creating a - CORRECT ANSWERS✅✅c. voltage decrease
You are performing a white blood cell count on a known leukemic patient. His WBC count
usually runs approximately 200 x 109/L. In order to count approximately 40 cells in each of
the four "W" squares, which of the following combinations of pipette and dilution would you
choose? - CORRECT ANSWERS✅✅d. RBC pipette, blood to 0.2
, Coincidence refers to: - CORRECT ANSWERS✅✅d. The simultaneous passage of more
than one cell through the aperture
The light source on optical cell counters usually is a: - CORRECT ANSWERS✅✅c. Laser
beam
The reason for allowing the dilution made in a platelet unopette to sit for 10 minutes before
plating is: - CORRECT ANSWERS✅✅c. to lyse red blood cells
The protein that is involved in the transport of iron in the plasma is: - CORRECT
ANSWERS✅✅c. transferrin
The largest quantity of body iron is found in the form of: - CORRECT ANSWERS✅✅e.
hemoglobin
In order for hemoglobin to bind properly with oxygen, the iron must have the following
valence: - CORRECT ANSWERS✅✅b. +2
The globin component of hemoglobin F - CORRECT ANSWERS✅✅d. is composed of 2
alpha and 2 gamma chains
Methemoglobin contains a: - CORRECT ANSWERS✅✅a. ferric form of iron
In hemoglobin S disease, there is a substitution of: - CORRECT ANSWERS✅✅a. valine for
glutamic acid
What is the function of the enzyme methemoglobin reductase in a red cell? - CORRECT
ANSWERS✅✅a. to keep iron in the ferrous state
Hemoglobinopathies such as HbS and C have abnormalities occurring in their: - CORRECT
ANSWERS✅✅b. beta chains of globin
QUESTIONS AND CORRECT ANSWERS
Blood collected in EDTA undergoes which of the following changes if kept at room
temperature for 6-24 hours? - CORRECT ANSWERS✅✅a. Increased hematocrit and MCV
To remove fresh blood from a lab coat you would: - CORRECT ANSWERS✅✅c. Apply a
3% hydrogen peroxide solution then rinse thoroughly with water
Which of the following achromatic objectives would be an oil immersion objective: -
CORRECT ANSWERS✅✅c. N.A. 1.25
A blood smear from an infant was examined and it was discovered that there were 20
nucleated erythrocytes for each 100 leukocytes counted. The observed WBC count as 3.6 x
109/L. What is the corrected (true) leukocyte count? - CORRECT ANSWERS✅✅b. 3.00 x
109/L
The diluent used for counting platelets by the Unopette method is: - CORRECT
ANSWERS✅✅c. 1% ammonium oxalate
The principle of counting the cells using anoptical cell counter is: - CORRECT
ANSWERS✅✅c. based on the scattering of light by cells
When a red blood cell count is performed on an electrical particle counter, the counter usually
- CORRECT ANSWERS✅✅b. includes white blood cells
Cells are counted on the Coulter Counter as they pass through a path between two electrodes
by creating a - CORRECT ANSWERS✅✅c. voltage decrease
You are performing a white blood cell count on a known leukemic patient. His WBC count
usually runs approximately 200 x 109/L. In order to count approximately 40 cells in each of
the four "W" squares, which of the following combinations of pipette and dilution would you
choose? - CORRECT ANSWERS✅✅d. RBC pipette, blood to 0.2
, Coincidence refers to: - CORRECT ANSWERS✅✅d. The simultaneous passage of more
than one cell through the aperture
The light source on optical cell counters usually is a: - CORRECT ANSWERS✅✅c. Laser
beam
The reason for allowing the dilution made in a platelet unopette to sit for 10 minutes before
plating is: - CORRECT ANSWERS✅✅c. to lyse red blood cells
The protein that is involved in the transport of iron in the plasma is: - CORRECT
ANSWERS✅✅c. transferrin
The largest quantity of body iron is found in the form of: - CORRECT ANSWERS✅✅e.
hemoglobin
In order for hemoglobin to bind properly with oxygen, the iron must have the following
valence: - CORRECT ANSWERS✅✅b. +2
The globin component of hemoglobin F - CORRECT ANSWERS✅✅d. is composed of 2
alpha and 2 gamma chains
Methemoglobin contains a: - CORRECT ANSWERS✅✅a. ferric form of iron
In hemoglobin S disease, there is a substitution of: - CORRECT ANSWERS✅✅a. valine for
glutamic acid
What is the function of the enzyme methemoglobin reductase in a red cell? - CORRECT
ANSWERS✅✅a. to keep iron in the ferrous state
Hemoglobinopathies such as HbS and C have abnormalities occurring in their: - CORRECT
ANSWERS✅✅b. beta chains of globin
