HEMATOLOGY EXAM WITH 100% CORRECT
ANSWERS 2026
]\
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
According to the laboratory procedure manual at General Hospital, hematocrits are to
be spun at 10,000 PRM for 4 minutes. A new employee centrifuged the hematocrits for
only 2 minutes at 5,000 RPM. The hematocrit value may be: correct answers b. falsely
increased
The stain used to visualize migration patterns in hemoglobin electrophoresis is: correct
answers e. Ponceau S
The difference in the charges of the various hemoglobins causing migration toward the
anode or cathode at different rates is caused by a variation in the: correct answers b.
amino acid composition
In cellulose acetate electrophoresis, adult hemoglobin (HbA1), migrates toward the
anode: correct answers b. faster than Hb S
In which of the following conditions will the hemoglobin values be decreased? correct
ANSWERS 2026
]\
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
According to the laboratory procedure manual at General Hospital, hematocrits are to
be spun at 10,000 PRM for 4 minutes. A new employee centrifuged the hematocrits for
only 2 minutes at 5,000 RPM. The hematocrit value may be: correct answers b. falsely
increased
The stain used to visualize migration patterns in hemoglobin electrophoresis is: correct
answers e. Ponceau S
The difference in the charges of the various hemoglobins causing migration toward the
anode or cathode at different rates is caused by a variation in the: correct answers b.
amino acid composition
In cellulose acetate electrophoresis, adult hemoglobin (HbA1), migrates toward the
anode: correct answers b. faster than Hb S
In which of the following conditions will the hemoglobin values be decreased? correct
