HEMA LAB- Methods of Blood Collection

Question 1

peripheral blood is obtained from which sites (2) in adults

Answer 1

1) tip of 3rd or 4th finger

2) earlobe

Question 2

ideal depth of puncture in skin puncture

Answer 2

2-3 mm

Question 3

why must squeezing puncture site in skin puncture be avoided

Answer 3

alters the composition of blood

Question 4

difficulty in blood collection in skin puncture can be relieved by

Answer 4

applying warm compress

Question 5

essential for tests that require anticoagualation (Except for microtechniques)

Answer 5

venipuncture

Question 6

most convenient method of blood collection

Answer 6

venipuncture

Question 7

reason why venipuncture is the most convenient method of blood collection

Answer 7

it reduces the number and variety of apparatus required

Question 8

methods of performing venipuncture

Answer 8

syringe method

evacuated tube method

Question 9

depth of needle in venipuncture

Answer 9

0.5 - 1 cm

Question 10

after obtaining required amount of blood, patient must never ____

Answer 10

flex the arm

Question 11

peripheral blood from infants obtained from (2)

Answer 11

heel

big toe

Question 12

peripheral blood from newborns obtained from

Answer 12

heel

Question 13

method recommended for whole blood clotting time technique

Answer 13

two-syringe method

Question 14

what happens to the jugular veins when the infant cries

Answer 14

becomes more prominent

Question 15

thin, flexible, hollow tubes inserted and positioned into a vein in order to access the bloodstream for delivery of therapies

Answer 15

CVADs

Question 16

CVAD meaning

Answer 16

Central Venous Access Devices

Question 17

two types of CVAD

Answer 17

catheter

port

Question 18

type of CVAD

have one end positioned externally like PICC

Answer 18

catheter

Question 19

PICC meaning

Answer 19

Peripherally inserted central catheters

Question 20

type of CVAD

surgically placed internally

Answer 20

port

Question 21

3 methods/procedure of blood collection from CVAD

Answer 21

Discard method
Push-pull method
Re-infusion method

Question 22

angle in arterial puncture

Answer 22

35 - 40

Question 23

prevention of hemolysis during blood collection
skin puncture (2)

Answer 23

use sharp lancet

avoid squeezing area near the site

Question 24

prevention of hemolysis during blood collection

venipuncture (7)

Answer 24

1. use a sharp, smooth needle
2. penetrate uppermost wall of the vein fully
3. check and make sure the tourniquet is NOT TOO TIGHT when aspirating blood
4. aspirate blood gently
5. remove needle before transferring blood to tubes (syringe method)
6. mix tube by gentle inversion if the tubes contain additives
7. if serum is needed, do not rim and centrifuge the blood until a clot has formed

Question 25

prevention of hemolysis during blood collection
arterial puncture (2)

Answer 25

use a sharp needle

avoid excessive needle manipulation

Question 26

how many mL of blood is aspirated when using the discard method of blood collection from CVAD

Answer 26

3-6 mL

Question 27

how many mL of blood is aspirated when using the re-infusion method of blood collection from CVAD

Answer 27

3-6 mL

Question 28

how many mL of blood is aspirated when using the push-pull method of blood collection from CVAD

Answer 28

6 mL

Question 29

CVAD is flushed with what solution

Answer 29

normal saline solution

Question 30

CVAD is flushed with NSS in which method/s

Answer 30

push-pull

discard

Question 31

vein that runs from an angle of the mandible to the submandibular area

Answer 31

external jugular vein

Question 32

how to immobilize arms of the infant during external jugular vein puncture

Answer 32

wrap infant in a sheet