Q: A laboratory technician is asked to calculate the mean corpuscular volume (MCV) for a patient with a hematocrit (Hct) of 42% and an RBC count of $$5.0 \times 10^6$/µL. Which formula should be used, and what is the MCV?

Use $$\text{MCV} = \frac{\text{Hct} \times 10}{\text{RBC}}$$; MCV = 84 fL

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 fatigue and pallor. Laboratory results show a low hemoglobin concentration and a low mean corpuscular volume (MCV). Which of the following is the most likely explanation for these findings?

Accepted Answer

The patient has iron deficiency anemia, resulting in microcytic, hypochromic RBCs

Question 3

Which vessel type is primarily responsible for the exchange of gases, nutrients, and waste products between blood and tissues?

Accepted Answer

Capillaries

Question 4

A laboratory technician is asked to calculate the mean corpuscular volume (MCV) for a patient with a hematocrit (Hct) of 42% and an RBC count of $$5.0 	imes 10^6$/µL. Which formula should be used, and what is the MCV?

Accepted Answer

Use $$	ext{MCV} = \frac{	ext{Hct} 	imes 10}{	ext{RBC}}$$; MCV = 84 fL

Question 5

Which of the following statements about veins is correct?

Accepted Answer

Veins contain valves to ensure one-way blood flow toward the heart

Question 6

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

Accepted Answer

The buffy coat between the plasma and RBC layers

Question 7

Which of the following best explains why EDTA is used as an anticoagulant in hematology testing?

Accepted Answer

EDTA chelates calcium ions, preventing blood clotting

Question 8

A patient’s hemoglobin (Hb) is measured at 15.0 g/dL and their RBC count is $$5.0 	imes 10^6$/µL. Using the formula $$	ext{MCH} = \frac{	ext{Hb} 	imes 10}{	ext{RBC}}$$, what is the mean corpuscular hemoglobin (MCH)?

Accepted Answer

MCH = 30 pg

Question 9

Which of the following is a correct reference range for hematocrit (Hct) in adult males?

Accepted Answer

42-50%

Question 10

A patient has a normal RBC count but a low hemoglobin concentration. Which of the following best describes the likely appearance of their red blood cells?

Accepted Answer

Normocytic, hypochromic

Question 11

Which of the following best describes the process of hematopoiesis during embryonic development?

Accepted Answer

It starts in the yolk sac, progresses to the fetal liver, and then to the bone marrow

Question 12

A laboratory is using the cyanmethemoglobin method to measure hemoglobin. What is the principle behind this method?

Accepted Answer

Hemoglobin is converted to a stable colored compound measured photometrically

Question 13

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

Accepted Answer

Forming a plug to stop bleeding in injured vessels

Question 14

A patient’s blood sample has a hematocrit of 36% and an RBC count of $$4.0 	imes 10^6$/µL. What is the mean corpuscular volume (MCV)? Use $$	ext{MCV} = \frac{	ext{Hct} 	imes 10}{	ext{RBC}}$$.

Accepted Answer

MCV = 90 fL

Question 15

Which of the following best explains why the concentration of hemoglobin in the blood is a critical measure in clinical hematology?

Accepted Answer

It reflects the blood’s ability to carry oxygen to tissues

Question 16

A patient’s hemoglobin is 12 g/dL, hematocrit is 36%, and RBC count is $$4.0 	imes 10^6$/µL. Calculate the mean corpuscular hemoglobin concentration (MCHC) using $$	ext{MCHC} = \frac{	ext{Hb}}{	ext{Hct}} 	imes 100$$.

Accepted Answer

MCHC = 33.3 g/dL

Question 17

Which of the following is a correct description of the structure of normal adult hemoglobin (HbA)?

Accepted Answer

Two alpha and two beta globin chains, each with a heme group

Question 18

Which of the following best describes the fate of iron when old erythrocytes are removed from circulation?

Accepted Answer

It is recycled into an iron storage pool for reuse in new RBC production

Question 19

A patient’s blood sample is analyzed and found to have a mean corpuscular hemoglobin (MCH) of 25 pg (reference range: 27-33 pg). What does this indicate about the patient’s red blood cells?

Accepted Answer

They are likely hypochromic, containing less hemoglobin than normal

Principles and Practice of Clinical Hematology: Study Guide

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드