$$\text{Cells}/\mu L = \frac{\text{Avg} \times DF}{A \times 0.1}$$

Question 1

Which of the following statements best describes the difference between quantitative and qualitative evaluation in hematology?

Accepted Answer

Quantitative evaluation measures the number of each type of blood cell, while qualitative evaluation assesses their appearance.

Question 2

A patient’s blood smear shows an increased number of band neutrophils. What does this most likely indicate?

Accepted Answer

The patient is likely experiencing an acute infection or inflammation.

Question 3

Which leukocyte is most active in allergic reactions and defense against parasitic infections?

Accepted Answer

Eosinophil

Question 4

What is the primary function of platelets (thrombocytes) in the bloodstream?

Accepted Answer

Maintain vascular integrity and participate in blood clotting

Question 5

Which of the following best describes the appearance of a mature monocyte under Wright stain?

Accepted Answer

Large cell with horseshoe-shaped, folded nucleus and abundant blue-gray cytoplasm with vacuoles

Question 6

Which formula is used to calculate the number of red blood cells per microliter using a hemacytometer?

Accepted Answer

$$	ext{Cells}/\mu L = \frac{	ext{Avg} 	imes DF}{A 	imes 0.1}$$

Question 7

During manual cell counting with a hemacytometer, which cells should be counted within a square?

Accepted Answer

All cells within the square and those touching the left and top boundaries

Question 8

A blood sample is diluted 1:100 for a WBC count using a hemacytometer. Which area should be counted?

Accepted Answer

All 9 mm$$^2$$ squares

Question 9

Which leukocyte contains granules with histamine and heparin, and is involved in immediate hypersensitivity reactions?

Accepted Answer

Basophil

Question 10

If a hemacytometer is loaded incorrectly and the fluid does not fill the chamber evenly, what is the most likely consequence?

Accepted Answer

The cell count will be inaccurate due to uneven distribution of cells.

Question 11

Which of the following is TRUE regarding lymphocytes?

Accepted Answer

They are associated with viral infections when their numbers increase.

Question 12

A patient presents with eosinophilia. Which of the following conditions is most likely associated with this finding?

Accepted Answer

Allergic reaction or drug reaction

Question 13

Which step is essential before viewing the hemacytometer under the microscope for cell counting?

Accepted Answer

Allowing the hemacytometer to stand for 2 minutes after loading

Question 14

Which of the following best describes the function of neutrophilic granules?

Accepted Answer

They contain enzymes that destroy bacteria.

Question 15

What is the correct calculation for the average number of cells counted on both sides of a hemacytometer?

Accepted Answer

$$	ext{Avg} = \frac{	ext{Total cells on both sides}}{2}$$

Question 16

Which of the following is NOT a characteristic of platelets?

Accepted Answer

They are the largest cells found in peripheral blood.

Question 17

Which cell type is most likely to increase in number during a viral infection?

Accepted Answer

Lymphocyte

Question 18

Which of the following best describes the nuclear characteristics of a segmented neutrophil?

Accepted Answer

Elongated, curved nucleus with coarse chromatin

Question 19

A laboratory technician counts 500 cells on one side and 520 cells on the other side of a hemacytometer. What is the average cell count?

Accepted Answer

$$\frac{500+520}{2} = 510$$

Question 20

Which of the following is a correct step in the cell counting pattern using a hemacytometer?

Accepted Answer

Move in a left-to-right, right-to-left (snake-like) pattern to ensure each cell is counted only once.

Principles and Practice of Clinical Hematology: Blood Cells and Their Evaluation

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