[MCQs] Hematocrit, Erythrocyte Sedimentation Rate, and Hemoglobin – Part 1 (25 test)

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1. When blood is centrifuged, the volume percentage occupied by the packed red cells is known as the:

1. Erythrocyte sedimentation rate (ESR).
2. Hematocrit.
3. Hemoglobin concentration.
4. Mean corpuscular volume.

2. The procedure for determining hematocrit is performed by:

1. Filling a capillary tube capillary with blood.
2. Centrifuging at constant speed for a constant period of time.
3. Measuring the packed-cell volume.
4. Automated sequential analyzers (the results are usually a calculated value).
5. All of the above.
6. a, c, and d.

3. The hematocrit is the most useful single index in determining the degree of:

1. Anemia.
2. Hypochromia or anemia.
3. Leukopenia.
4. Thrombocytopenia or thrombocvtosis.

4. The hematocrit error rate for determining the degree of polycythemia is:

1. 1-3 percent.
2. 2-5 percent.
3. 2-4 percent.
4. 3-6 percent.

5. In contrast to hematological determinations, what is the percent error rate for the direct red blood cell chamber count?

1. 2-4 percent.
2. 5-9 percent.
3. 6-8 percent.
4. 8-10 percent.

6. The hematocrit values closely parallel the values for the:

1. Packed WBCs and hemoglobin.
2. Packed-cell blood count and reagent.
3. WBC count and hemoglobin.
4. Hemoglobin and RBC count.

7. Which microhematocrit principle is correct?

1. A capillary tube is filled with plasma by capillary action to within 1 to 2 cm of the end. The unfilled end is sealed and the tube is centrifuged. After centrifugation, the capillary tube is placed in a reading device and the hematocrit value determined.
2. A capillary tube is filled with whole blood by capillary action to within 1 to 2 cm of the end. The unfilled end is sealed and the tube is centrifuged. After centrifugation, the capillary tube is placed in a reading device and the hematocrit value determined.
3. A capillary tube is filled with whole blood by capillary action to within 2 to 4 cm of the end. The unfilled end is sealed and the tube is centrifuged. After centrifugation, the capillary tube is placed in a reading device and the hematocrit value determined.
4. A capillary tube is filled with whole blood by capillary action to within 1 to 2 cm of the end.  The filled end is sealed and the tube is centrifuged. After centrifugation, the capillary tube is read and recorded.

8. Centrifugation for the microhematocrit lasts:

1. 30 seconds.
2. 30 minutes.
3. 1 minute.
4. 5 minutes.

9. During the microhematocrit test, blood without anticoagulant is identified by a heparinized capillary tube with a

1. Green.
2. Red.
3. Yellow.
4. Pink.

10. When performing the microhematocrit test, if blood contains anticoagulant, how far up should the capillary tube re filled with blood?

1. One forth.
2. Halfway.
3. Three fourths.
4. Completely.

11. Measuring the microhematocrit test, when blood is allowed to enter the two capillary tubes to approximately 2/3 full and air bubbles appear, what does this signify?

1. A poor technique was used but it does not affect the results of  the test.
2. The heparinized capillary tube line was passed.
3. The tubes were dirty.
4. The seal was broken.

12. At what rpm and for how long are the 2 hematocrit tubes centrifuged for the microhematocrit test?

1. 4,000 rpm; 2 minutes.
2. 5,000 rpm; 4 minutes.
3. 10,000 rpm; 5 minutes.
4. 15,000 rpm; 7 minutes.

13. When using the microhematocrit reader, the results should agree within………………….. If they do not, then what should occur?

1. 1 percent; nothing.
2. 2 percent; nothing.
3. 2 percent; repeat the procedure.
4. 3 percent; repeat the procedure.

14. Hematocrit results computed with an electronic cell counter are generally …………………….. than a manual hematocrit.

1. 1 per cent lower.
2. 4-6 percent higher.
3. 1-4 percent lower.
4. 1-3 percent higher.

15. The rate at which red blood cells fall when anticoagulated whole blood is allowed to stand is known as:

1. Plasma composition.
2. Erythrocyte sedimentation.
3. Coulter models.
4. Spherocytosis.

16. Erythrocyte sedimentation is retarded when the hematocrit exceeds:

1. 35 percent.
2. 40 percent.
3. 45 percent.
4. 55 percent.

17. The normal hematocrit readings for adult males and adult females are respectively:

1. 38-47 percent and 34-41 percent.
2. 44-64 percent and 34-41 percent.
3. 44-64 percent and 40-54 percent.
4. 42-52 percent and 36-46 percent.

18. Size and shape of the erythrocytes cause the erythrocyte sedimentation rate (ESR) to:

1. Increase.
2. Remain the same.
3. Decrease.
4. Fluctuate.

19. During erythrocyte sedimentation and with certain diseases, what kind of formation may form in the plasma protein if the plasma protein fibrinogen and globulin are altered?

1. Round.
2. Long.
3. Rouleaux.
4. Short.

20. What happens to the mass of plasma and to the sedimentation rate when the plasma protein of fibrinogen and globulin are altered?

1. Mass enlarges; rate increases.
2. Mass decreases; rate decreases.
3. Mass shrivels; rate increases.
4. Mass enlarges; rate decreases.

21. Keeping in mind the mechanical and technical factors, why is it important that the ESR tube be exactly perpendicular?

1. A tilt of 50 can cause errors up to 55 percent.
2. A tilt of 30 can cause errors up to 30 percent.
3. A tilt of 10 can cause errors up to o. 05 percent.
4. There are no other factors that effect the ESR tube.

22. What other mechanical and technical factors are important and why when working with the ESR tube or holding rack?

1. Spilling the ESR tube or tilting holding rack can affect the ESR, as can large changes in temperature.
2. Static electricity or movement of the ESR tube or holding rack can affect the ESR, as can large changes in temperatube.
3. Vibration or movement of the ESR tube or holding rack can affect the ESR as can large changes in temperature.
4. There are no other factors.

23. When determining the ESR, using the Wintrobe-Landsberg method, what happens to the anticoagulated blood and how is this procedure measured?

1. The anticoagulated blood is placed in a narrow tube/
2. The blood cells settle out of the suspension, leaving clear plasma above them.
3. The distance that the erythrocytes fall within a given interval of time is measured.
4. a, b, and c all happen.
5. a and d happen.
6. None of the above.

24. With the Wintrobe-Landsberg method, which tube is used to draw 5 ml of blood by venipuncture?

1. Green top vacuum tube.
2. Lavender top vacuum tube.
3. Red lined tube.
4. Blue lined tube.

25. After the Wintrobe tube is placed in a rack in an exactly vertical position and the time and room temperature are noted, when is a reading taken and what is observed?

1. At the end of exactly 1 hour, read the level to which the red cells have settled on the descending scale etched on the tube.
2. At the end of exactly 2 hour, read the level to which the red cells have settled on the descending scale etched on the tube.
3. Within 15 minute, read the level to which the red cells have settled on the ascending scale etched on the tube.
4. In 5 minutes, read the level to which the red cells have settled on the descending scale etched on the tube.