[MCQs] Collection of Blood and Preparation of Blood Smears Quiz- Part 1 (25 test)

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1. To obtain valid blood test results, specimens must be properly:

1. Collected.
2. Processed
3. Recorded.
4. a and c.
5. a, b, and c.

2. Blood counts on venous and capillary blood are nearly the same if the capillary puncture is:

1. Shallow.
2. Sterile.
3. Free-flowing.
4. Located on the finger.

3. Valid blood counts cannot be made when:

1. Capillary specimens are not taken from a free-flowing sample.
2. When capillary specimens are obtained from cyanotic or calloused areas.
3. a and b.
4. When sources vary as much as 150 to 1550 cells per cu mm from the real value.

4. Venous samples are preferred over capillary samples because they:

1. Allow for several and repeated hematological examinations.
2. Provide a sufficient amount of blood to perform the variouslaboratory tests needed.
3. Provide for less chance of error because operations are made under better conditions and repeated operations are possible.
4. a, b, and c.

5. Which blood count method would be performed if blood from extensive burn victims was needed?

1. Venous.
2. Capillary (micro quantitative).
3. Neither method.
4. Both methods.

6. When collecting blood for white blood cell counts, blood obtained from free-flowing areas or areas of local stasis sources can vary as much as:

1. 400-1000 cells per cu mm from their real value.
2. 800-1200 cells per cu mm from their real value.
3. 1000-1300 cells per cu mm from their real value.
4. 1000-1500 cells per cu mm from their real value.

7. For adults, which veins should be used for venipuncture?

1. Veins located in the distal forearm or antecubital space.
2. Veins located in the proximal forearm or antecubital space.
3. The jugular vein.
4. The femoral vein or antecubital space.

8. For the elderly or debilitated persons, or those who may have sclerosed or fragile veins, what should you do for the venipuncture?

1. Consult with a physician concerning the procedure.
2. Take blood from the veins located in the proximal forearm or antecubital space.
3. Use the jugular vein.
4. Select the femoral vein.

9. If blood is needed from infants, which veins should be used for thevenipuncture?

1. Sagittal sinus area.
2. Veins located in the proximal forearm or antecubital space.
3. The collapsed vein.
4. The jugular or femoral vein. The vein selected should be large, readily accessible, and sufficiently close to the surface to be seen and palpated.

10. If venipuncture poses a problem due to the age of the patient, sclerotization due to repeated venipuncture, or any other unusual circumstance, which procedure is to be followed?

1. Under some circumstances the technician should withdrawblood from a sagittal sinus, jugular vein, or femoral vein.
2. Under no circumstances should a technician withdraw blood from a sagittal sinus, jugular vein, or femoral vein.
3. The technician may withdraw blood from a sagittal sinus, jugular vein, or femoral vein.
4. Withdraw blood from a sagittal sinus, jugular vein, or femoral vein.
5. If the need arises, the technician should withdraw blood from, a sagittal sinus or jugular vein, but not from the femoral vein.

11. Which item of equipment is normally used for the collection ofblood specimens?

1. Isopropyl alcohol, 40 percent.
2. Gauze pads, 6 x 6 inches.
3. Needle, 1 to 1 1/2 inches, 19-23 gauge.
4. Needle, large bevel.

12. Veins are made easier to enter if:

1. The site of puncture is gently slapped.
2. The vein is massaged toward the heart.
3. a and b.
4. The arm hangs down for 4-6 minutes.
5. All of the above.

13. Generally speaking, veins from which group of people tend to collapse more easily; and, therefore, greater care may be needed to select and puncture the vein?

1. Children.
2. Middle-aged people.
3. Elderly.

14. Blood collection instruments should be:

1. Glass and disposable.
2. Plastic and calibrated.
3. Sterile and disposable.
4. Aseptic and anticoagulated.

15. The syringe and needle for venipuncture must be dry to avoid                                  of the red blood cells.

1. Hemolysis.
2. Coagulation.
3. Contamination.
4. Hemoglobin reduction.

16. To prevent an injection of air into the vein, which can be fatal, what must the technician do?

1. Use a longer plunger than the syringe.
2. Use a shorter plunger than the syringe.
3. It makes no difference.
4. The plunger must match the syringe.

17. If latex tubing is used as a tourniquet, how far above the venipuncture site should it be secured?

1. 1 inch.
2. 2 inches.
3. 3 inches.
4. 4 inches.

18. Prolonged application of a tourniquet may change the concentration of many blood components. The maximum period over which a tourniquet should be applied for a venipuncture is:

1. 1 minute.
2. 2 minutes.
3. 4 minutes.
4. 6 minutes.

19. Besides inspecting and palpating to locate the desired vein for venipuncture, on what other two items should you focus?

1. Direction of vein course and estimate its size and depth.
2. Direction of vein course and estimate its length and color.
3. Direction of vein course and estimate its position and elasticity.
4. The vein’s thickness, length, and size.

20. When preparing for the venipuncture, what should be done with the needle?

1. Keep the cap on until ready to draw.
2. Place it on a sterile pad.
3. Throw it away.

21. What are the reasons for inspecting a possible puncture site?

1. Estimate the size and depth of the vein (some may be too small or shallow).
2. Determine the direction of the vein’s course (puncture with the grain, so to speak).
3. Palpate the vein (for resiliency).
4. All of the above.

22. What may not be done once the puncture area is cleansed and excess alcohol wiped off?

1. Grasp the forearm with the left hand.
2. Straighten the arm.
3. Contaminate the area.
4. Have the patient make a clenched fist.

23. Puncture of the Vacutainer stopper is completed immediately:

1. Before the needle enters the vein.
2. After the needle enters the vein.
3. Before withdrawal of the needle.
4. After withdrawal of the needle.

24. Which way is the needle bevel supposed to be and how is it to be situated at time of entry?

1. Bevel side down, parallel with, and alongside the vein.
2. Bevel side up, adjunct with, and alongside the vein.
3. Bevel side perpendicular to, and close to the vein.
4. Bevel side up, parallel with, and alongside the vein.

25. After the needle for a venipuncture is withdrawn, what must the patient do?

1. Take an iron compound.
2. Lie down for 10 minutes.
3. Keep his fist clenched for 5 minutes.
4. Maintain light pressure on the gauze pad over the site.