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HEMATOCRIT, ERYTHROCYTE SEDIMENTATION RATE, AND HEMOGLOBIN - Part 1
See all quizzes of the Hematocrit, Erythrocyte Sedimentation Rate, and Hemoglobin at here:
Part 1 (25 test) | Part 2 (25 test – end)
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1. When blood is centrifuged, the volume percentage occupied by the packed red cells is known as the:
- Erythrocyte sedimentation rate (ESR).
- Hematocrit.
- Hemoglobin concentration.
- Mean corpuscular volume.
2. The procedure for determining hematocrit is performed by:
- Filling a capillary tube capillary with blood.
- Centrifuging at constant speed for a constant period of time.
- Measuring the packed-cell volume.
- Automated sequential analyzers (the results are usually a calculated value).
- All of the above.
- a, c, and d.
3. The hematocrit is the most useful single index in determining the degree of:
- Anemia.
- Hypochromia or anemia.
- Leukopenia.
- Thrombocytopenia or thrombocvtosis.
4. The hematocrit error rate for determining the degree of polycythemia is:
- 1-3 percent.
- 2-5 percent.
- 2-4 percent.
- 3-6 percent.
5. In contrast to hematological determinations, what is the percent error rate for the direct red blood cell chamber count?
- 2-4 percent.
- 5-9 percent.
- 6-8 percent.
- 8-10 percent.
6. The hematocrit values closely parallel the values for the:
- Packed WBCs and hemoglobin.
- Packed-cell blood count and reagent.
- WBC count and hemoglobin.
- Hemoglobin and RBC count.
7. Which microhematocrit principle is correct?
- 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.
- 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.
- 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.
- 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:
- 30 seconds.
- 30 minutes.
- 1 minute.
- 5 minutes.
9. During the microhematocrit test, blood without anticoagulant is identified by a heparinized capillary tube with a
- Green.
- Red.
- Yellow.
- Pink.
10. When performing the microhematocrit test, if blood contains anticoagulant, how far up should the capillary tube re filled with blood?
- One forth.
- Halfway.
- Three fourths.
- 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?
- A poor technique was used but it does not affect the results of the test.
- The heparinized capillary tube line was passed.
- The tubes were dirty.
- The seal was broken.
12. At what rpm and for how long are the 2 hematocrit tubes centrifuged for the microhematocrit test?
- 4,000 rpm; 2 minutes.
- 5,000 rpm; 4 minutes.
- 10,000 rpm; 5 minutes.
- 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 percent; nothing.
- 2 percent; nothing.
- 2 percent; repeat the procedure.
- 3 percent; repeat the procedure.
14. Hematocrit results computed with an electronic cell counter are generally …………………….. than a manual hematocrit.
- 1 per cent lower.
- 4-6 percent higher.
- 1-4 percent lower.
- 1-3 percent higher.
15. The rate at which red blood cells fall when anticoagulated whole blood is allowed to stand is known as:
- Plasma composition.
- Erythrocyte sedimentation.
- Coulter models.
- Spherocytosis.
16. Erythrocyte sedimentation is retarded when the hematocrit exceeds:
- 35 percent.
- 40 percent.
- 45 percent.
- 55 percent.
17. The normal hematocrit readings for adult males and adult females are respectively:
- 38-47 percent and 34-41 percent.
- 44-64 percent and 34-41 percent.
- 44-64 percent and 40-54 percent.
- 42-52 percent and 36-46 percent.
18. Size and shape of the erythrocytes cause the erythrocyte sedimentation rate (ESR) to:
- Increase.
- Remain the same.
- Decrease.
- 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?
- Round.
- Long.
- Rouleaux.
- Short.
20. What happens to the mass of plasma and to the sedimentation rate when the plasma protein of fibrinogen and globulin are altered?
- Mass enlarges; rate increases.
- Mass decreases; rate decreases.
- Mass shrivels; rate increases.
- Mass enlarges; rate decreases.
21. Keeping in mind the mechanical and technical factors, why is it important that the ESR tube be exactly perpendicular?
- A tilt of 50 can cause errors up to 55 percent.
- A tilt of 30 can cause errors up to 30 percent.
- A tilt of 10 can cause errors up to o. 05 percent.
- 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?
- Spilling the ESR tube or tilting holding rack can affect the ESR, as can large changes in temperature.
- Static electricity or movement of the ESR tube or holding rack can affect the ESR, as can large changes in temperatube.
- Vibration or movement of the ESR tube or holding rack can affect the ESR as can large changes in temperature.
- 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?
- The anticoagulated blood is placed in a narrow tube/
- The blood cells settle out of the suspension, leaving clear plasma above them.
- The distance that the erythrocytes fall within a given interval of time is measured.
- a, b, and c all happen.
- a and d happen.
- None of the above.
24. With the Wintrobe-Landsberg method, which tube is used to draw 5 ml of blood by venipuncture?
- Green top vacuum tube.
- Lavender top vacuum tube.
- Red lined tube.
- 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?
- 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.
- 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.
- Within 15 minute, read the level to which the red cells have settled on the ascending scale etched on the tube.
- In 5 minutes, read the level to which the red cells have settled on the descending scale etched on the tube.
1 comment
Thank you