[MCQs] Hematocrit, Erythrocyte Sedimentation Rate, and Hemoglobin – Part 2 (25 test)

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1. If measurement of the ESR is delayed more than 2 hours after blood collection, the reading may be inaccurate because of a:

1. False varied sedimentation rate.
2. False low sedimentation on rate.
3. False high sedimentation rate.
4. Varied sedimentation rate.

2. For the Wintrobe-Landsberg method, to determine the ESR fill the Wintrobe tube to the mark while holding it at                           

1. 0, 30 degrees.
2. 0, 45 degrees.
3. 5, 10 degrees.
4. 10,50 degrees.

3. If the tube is at a 3⁰ variation from vertical this is a source of error and will accelerate the ESR by

1. 30 percent.
2. 30 percent.
3. 40 percent.
4. 50 percent.

4. When using the modified Westergren method, whole blood is diluted with                   percent sodium chloride and mixed for                 minutes.

1. 0.85 percent, 2.
2. 0.90 percent, 3.
3. 0.95 percent, 4.
4. 0.80 percent, 2.

5. Using the modified Westergren method, what is the normal value ESR for children?

1. 0-15 mm per hour.
2. 0-20 mm per hour.
3. 0-10 mm per hour.
4. 0-25 mm per hour.

6. Once hemoglobin gives up its oxygen to the tissues, it is known as:

1. Methemoglobin.
2. Carboxyhemoglobin.
3. Cyanmethemoglobin.
4. Reduced hemoglobin.

7. Hemoglobin reacts with oxygen to form:

1. Oxyhemoglobin.
2. Methemoglobin.
3. Cyanmethemoglobin.
4. Carboxyhemoglobin.

8. Which compound results when methemoglobin combines with the cyanide radical?

1. Oxyhemoglobin.
2. Sulfhemogobin.
3. Cyanmethemoglobin.
4. Carboxyhemoglobin.

9. As ferrous iron in hemoglobin is oxidized to the ferric state, which of the following is produced?

1. Methemoglobin.
2. Carboxyhemoglobin.
3. Carbaminohemglobin.
4. Reduced hemoglobin.

10. Which constitutes most of the hemoglobin of a normal adult?

1. Hemoglobin F.
2. Hemoglobin A₂.
3. Hemoglobin A.
4. Hemoglobin S.

11. Which is normally present in infants of less than 6 months but not normally present in adults?

1. Hemoglobin A.
2. Hemoglobin A₂.
3. Hemoglobin F.
4. Hemoglobin S.

12. When hemoglobin combines with oxygen, its iron must be in what state?

1. Ferrous.
2. Globulin.
3. Anemic.
4. Active.

13. How many basic ways are there to measure the hemoglobin concentration?

1. 2.
2. 3.
3. 4.
4. 5.

14. Which method is the most widely used to measure the hemoglobin concentration of blood?

1. Gasometric.
2. Cyanmethemoglobin.
3. Chemical.
4. Specific gravity.

15. What does the spectrophotometer’s 540 mm wavelength measure during the hemoglobin reaction using the cyanmethemoglobin method?

1. Specific gravity.
2. Proportionalism.
3. Color intensity.
4. Concentration.

16. AI though the cyanmethemoglobin method is accurate, what is a disadvantage of using it?

1. It is not the most direct method.
2. If the cyanide compounds are handled incorrectly, they can be hazardous.
3. Venous samples give erratic values.
4. Its hemoglobin pigments are not stable.

17. The normal concentration of hemoglobin in blood of the adult male is:    

1. 10-15 g/dl.
2. 12-16 g/dl.
3. 14-17 g/dl.
4. 18-27 g/dl.

18. Reduced hemoglobin S is insoluble in:

1. Urea.
2. Anticoagulated blood.
3. Cyanmethemoglobin standards.
4. Phosphate buffer solution.

19. What may happen to tile sodium dithionite reagent if it becomes damp?

1. Dissolve.
2. Enlarge.
3. Ignite.
4. Remain the same.

20. Which cells sickle more rapidly than AS cells?

1. SS cells.
2. SC cells.
3. SD cells.
4. a, b, and c.
5. a and c.

21. Erythrocytes of persons with sickle cell anemia or trait will assume a sickle shape when:

1. The oxygen tension is lowered.
2. The oxygen tension is raised.
3. An electrophoretic pattern is run.
4. Highly oxygenated blood is observed.

22. Sickle cell anemia is caused by:

1. Endocrine disorders.
2. Massive hemorrhage.
3. Chronic hemorrhage.
4. An inherited protein abnormality of hemoglobin.

23. Which reagent is added and mixed with the blood to determine if sickle cells are present?

1. Sodium rnetabisulfite, 2 percent.
2. Diathionite.
3. Sodium metabisulfite, 9 percent.
4. Acetic acid. 4 percent.

24. In hemoglobin electrophoresis, how is hemoglobin A₂ differentiated from hemoglobin C?

1. Quantity present.
2. Color after staining.
3. Degree of mobility.
4. Symptoms of patient.

25. Dithionite is:

1. Totally stable.
2. Very stable.
3. Not stable.
4. Limited in stability.