PRETEST
True or False
1. An individual who collects blood specimens is known as a vampire.
2. The purpose of applying a tourniquet when performing venipuncture is to make the patient's veins stand out.
3. The tourniquet should be left on the patient's arm for at least 2 minutes before performing a venipuncture.
4. Serum is obtained from whole blood that has been centrifuged.
5. A 25-gauge needle is recommended for performing venipuncture with the Vacutainer method.
6. The size of the collection tube used to obtain a venous blood specimen depends on the size of the patient's veins.
7. The correct order of draw evacuated blood collection tubes is red, lavender, gray, and green.
8. Veins are most likely to collapse in patients with large veins and thick walls.
9. Hemolysis of a blood specimen results in inaccurate test results.
10. When obtaining a capillary specimen, the first drop of blood should be used for the test.
POSTTEST
True or False
1. Venous reflux can be prevented by filling the collection tube to the exhaustion of the vacuum.
2. If the tourniquet is applied too tightly, inaccurate test results may occur.
3. The median cubital vein is the best vein to use for venipuncture.
4. On standing, a blood specimen to which an anticoagulant has been added separates into plasma and red blood cells.
5. Whole blood is obtained by using a tube containing an anticoagulant.
6. An evacuated blood collection tube with a lavender stopper contains EDTA.
7. A red-stoppered tube is used to collect a blood specimen for most blood chemistry tests.
8. Not filling a tube to the exhaustion of the vacuum can result in hemolysis of the blood.
9. If the needle is removed from the arm before removing the tourniquet, internal and external bleeding may occur around the puncture site.
10. If a fibrin clot forms in the serum layer of a blood specimen, it will lead to inaccurate test results.