Q: A patient’s blood sample is spun in a centrifuge. The resulting tube shows 40% red blood cells, 1% buffy coat, and 59% plasma. What is the patient’s hematocrit, and is it within the normal range for a female?

$$\text{Hematocrit} = \frac{\text{Volume of RBCs}}{\text{Total Blood Volume}} \times 100\% = \frac{40}{100} \times 100\% = 40\%. $$This is slightly below the normal range for a female.

Q: Which of the following is the correct formula for calculating hematocrit?

$$\text{Hematocrit} = \frac{\text{Volume of formed elements}}{\text{Total blood volume}} \times 100\%$$

Question 1

Which of the following best describes the composition of whole blood by percentage?

Accepted Answer

Plasma 55%, Formed elements 45%

Question 2

A patient’s blood sample is spun in a centrifuge. The resulting tube shows 40% red blood cells, 1% buffy coat, and 59% plasma. What is the patient’s hematocrit, and is it within the normal range for a female?

Accepted Answer

$$	ext{Hematocrit} = \frac{	ext{Volume of RBCs}}{	ext{Total Blood Volume}} 	imes 100\% = \frac{40}{100} 	imes 100\% = 40\%. $$This is slightly below the normal range for a female.

Question 3

Which formed element is most numerous in blood and what is its primary function?

Accepted Answer

Erythrocytes; transport oxygen and carbon dioxide

Question 4

A blood smear shows a cell with a multi-lobed nucleus and pale red cytoplasmic granules. What is this cell and its main function?

Accepted Answer

Neutrophil; phagocytosis of bacteria

Question 5

Which plasma protein is most abundant and what is its primary role?

Accepted Answer

Albumin; maintains osmotic pressure

Question 6

A patient’s Tallquist test result matches the color for 10 g/dL hemoglobin. What does this indicate?

Accepted Answer

Suggestive anemia for both men and women

Question 7

Which blood cell type increases in number during a parasitic worm infection?

Accepted Answer

Eosinophil

Question 8

A blood sample agglutinates with Anti-A serum but not with Anti-B or Anti-D serum. What is the blood type?

Accepted Answer

A-

Question 9

Which of the following is the correct formula for calculating hematocrit?

Accepted Answer

$$	ext{Hematocrit} = \frac{	ext{Volume of formed elements}}{	ext{Total blood volume}} 	imes 100\%$$

Question 10

Which of the following best describes the function of platelets?

Accepted Answer

Seal small tears in blood vessels and are instrumental in blood clotting

Question 11

A patient’s blood test shows the following WBC percentages: Neutrophils 65%, Lymphocytes 25%, Monocytes 6%, Eosinophils 3%, Basophils 1%. Which WBC is outside its normal range?

Accepted Answer

None; all values are within normal ranges

Question 12

Which of the following is a correct interpretation of a blood sample with agglutination in Anti-B and Anti-D serums, but not in Anti-A serum?

Accepted Answer

Blood type B+

Question 13

Which cell type is characterized by a large, round nucleus and is primarily involved in specific immunity?

Accepted Answer

Lymphocyte

Question 14

A patient with a hematocrit of 55% is most likely experiencing which condition?

Accepted Answer

Polycythemia

Question 15

Which of the following best describes the function of basophils?

Accepted Answer

Release histamine and other mediators of inflammation

Question 16

Which of the following is the correct normal range for hemoglobin concentration in adult males?

Accepted Answer

14–18 g/dL

Question 17

A patient’s blood sample shows no agglutination with Anti-A, Anti-B, or Anti-D serums. What is the blood type?

Accepted Answer

O-

Question 18

Which of the following is a function of monocytes?

Accepted Answer

Act as macrophages to phagocytize pathogens or debris

Question 19

Which of the following best describes the procedure for the Tallquist hemoglobin test?

Accepted Answer

Place a drop of blood on Tallquist paper, match the color to the scale, and determine hemoglobin concentration

Question 20

Which of the following is the least abundant type of leukocyte in normal blood?

Accepted Answer

Basophil

Blood: Structure, Function, and Laboratory Analysis

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