Q: What is the correct formula for calculating Mean Corpuscular Volume (MCV)?

$$\mathrm{MCV} = \frac{\mathrm{Hct} \times 10}{\mathrm{RBC}}$$

Q: A patient’s blood sample has a hematocrit of 38% and an RBC count of $$4.0 \times 10^6$/uL. What is the MCV?

$$\mathrm{MCV} = \frac{38 \times 10}{4.0} = 95 fL$$

Q: Which of the following is the correct formula for calculating Mean Corpuscular Hemoglobin (MCH)?

$$\mathrm{MCH} = \frac{\mathrm{Hb} \times 10}{\mathrm{RBC}}$$

Q: A patient’s blood sample has a hemoglobin of 15.0 g/dL and an RBC count of $$4.0 \times 10^6$/uL. What is the MCH?

$$\mathrm{MCH} = \frac{15.0 \times 10}{4.0} = 37.5 pg$$

Question 1

Which of the following best describes the primary function of erythrocytes (RBCs) in the circulatory system?

Accepted Answer

To transport oxygen to tissues and remove carbon dioxide from tissues

Question 2

A patient presents with symptoms of anemia. Laboratory tests reveal a low hemoglobin concentration. Which of the following is most likely to be deficient in this patient?

Accepted Answer

Iron

Question 3

Which blood vessel type is primarily responsible for the exchange of oxygen and carbon dioxide between blood and tissues?

Accepted Answer

Capillaries

Question 4

What is the correct formula for calculating Mean Corpuscular Volume (MCV)?

Accepted Answer

$$\mathrm{MCV} = \frac{\mathrm{Hct} 	imes 10}{\mathrm{RBC}}$$

Question 5

A blood sample is centrifuged in a microhematocrit tube. Which layer contains the majority of white blood cells and platelets?

Accepted Answer

Buffy coat

Question 6

Which laboratory test is most commonly used to evaluate the oxygen-carrying capacity of blood?

Accepted Answer

Hemoglobin concentration

Question 7

During hematopoiesis, where does blood cell production begin in embryonic development?

Accepted Answer

Yolk sac

Question 8

Which of the following is a correct reference range for adult male hemoglobin concentration?

Accepted Answer

14.0–17.5 g/dL

Question 9

A patient’s blood sample has a hematocrit of 38% and an RBC count of $$4.0 	imes 10^6$/uL. What is the MCV?

Accepted Answer

$$\mathrm{MCV} = \frac{38 	imes 10}{4.0} = 95 fL$$

Question 10

Which anticoagulant is most commonly used for hematology testing and what is its mode of action?

Accepted Answer

EDTA; chelates calcium ions

Question 11

Which of the following is NOT a function of the circulatory system?

Accepted Answer

Producing hormones for metabolism

Question 12

Which of the following statements about veins is TRUE?

Accepted Answer

Veins contain valves to ensure one-way blood flow

Question 13

Which of the following is the correct formula for calculating Mean Corpuscular Hemoglobin (MCH)?

Accepted Answer

$$\mathrm{MCH} = \frac{\mathrm{Hb} 	imes 10}{\mathrm{RBC}}$$

Question 14

Which of the following is a correct reference range for Mean Corpuscular Hemoglobin Concentration (MCHC) in adults?

Accepted Answer

33–36 g/dL

Question 15

A patient’s blood sample has a hemoglobin of 15.0 g/dL and an RBC count of $$4.0 	imes 10^6$/uL. What is the MCH?

Accepted Answer

$$\mathrm{MCH} = \frac{15.0 	imes 10}{4.0} = 37.5 pg$$

Question 16

Which of the following is a function of thrombocytes (platelets)?

Accepted Answer

Forming a plug to stop bleeding in injured vessel walls

Question 17

Which of the following statements about hemoglobin structure is correct?

Accepted Answer

Hemoglobin consists of four heme groups and four globin chains

Question 18

Which type of hemoglobin is predominant in healthy adults?

Accepted Answer

Hemoglobin A

Question 19

A laboratory technician is preparing a blood sample for a CBC. Which specimen type is most appropriate for repeated testing and accurate cell morphology?

Accepted Answer

Venous blood with EDTA anticoagulant

Question 20

Which of the following best explains why old erythrocytes are removed from circulation?

Accepted Answer

Their membranes become less flexible and enzyme activity diminishes

Principles and Practice of Clinical Hematology: An Introduction

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