practicum 50 multiple choice

Question 1

Abs that can cause a HDN

Answer 1

ABO/Rh, Kell, Duffy

Question 2

Abs that may cause HTR

Answer 2

Kidd, ABO incompat.

Question 3

Abs that may cause Delayed HTR

Answer 3

Kidd (jka, jkb), Duffy, Kell, MNS

Question 4

How are cold agglutinans excluded from testing?

Answer 4

cold agglut-absorption

Question 5

How is rouleaux excluded from testing?

Answer 5

saline replacement

Question 6

What Abs are detected at IS?

Answer 6

Lewis, MN, P1

Question 7

What Abs are detected at 37 degrees?

Answer 7

Rh, MN

Question 8

What Abs are detected at AHG phase?

Answer 8

Kell, Duffy and Kidd

Question 9

Interval between donations

Answer 9

8 weeks

Question 10

minimum Hgb for donation

Answer 10

> 12.5

Question 11

minimum Hct for donation

Answer 11

> 38%

Question 12

maximum volume of blood drawn during donation

Answer 12

525 mL (normal 450 mL)

Question 13

minimum body weight for donation

Answer 13

110 lbs

Question 14

max body temp for donation

Answer 14

37.5/ 99.5

Question 15

how long is the deferred period if person spent time in a malaria area?

Answer 15

1 year

Question 16

how long is the deferral after having malaria?

Answer 16

3 years

Question 17

what blood type is used for emergency release and alternate blood selection?

Answer 17

O pos

Question 18

Refrigerator temp for RBCs

Answer 18

1-4 degrees

Question 19

shelf life after breakage of hermetic seal

Answer 19

24 hrs

Question 20

length of time recipient samples are saved for

Answer 20

7 days

Question 21

temp range during whole blood shipping

Answer 21

1-10 C

Question 22

reason to discard a unit of blood

Answer 22

hemolyzed

clots

Question 23

which blood group has the most reactivity with anti-H

Answer 23

Group O is strongest

Question 24

hemophiliac patient would need what type of blood component?

Answer 24

cryo (contains concentrated fibrinogen and factor VIII)

Question 25

what is unique about the Lewis system

Answer 25

only blood group system not manufactured by the RBCs. pregnant women may present Le(a-b-) and produce Lewis Abs even though true phenotype is Le(a-b+). can show in saliva and tears

Question 26

what Abs are found in Bombay individuals?

Answer 26

ALL | Anti-A, Anti-B, Anti-A,B, H

Question 27

what blood group Ags are enhanced by enzymes?

Answer 27

Lewis, Rh, Kidd

Question 28

what blood group Ags are destroyed by enzymes?

Answer 28

Duffy, MNS

Question 29

what would you expect if a Rh neg patient who has never been transfused or pregnant was transfused with pos donor blood?

Answer 29

no transfusion reaction because no Abs are present due to no previous exposure

Question 30

when should Rhogam be given

Answer 30

Rh - mother Rh+ baby

Question 31

define elution

Answer 31

used to remove Abs that may be bound to the RBCs

Question 32

define forward typing

Answer 32

using forward known serum Abs to detect unknown Ags

Question 33

define DAT

Answer 33

used to diagnose HDN, HTR and AIHA if + perform an elution to remove Ab to ID specific eluate (( Direct Coombs use patient cells))

Question 34

define polyspecific

Answer 34

has both complement and IgG

Question 35

what is the anti-A1 lectin used to detect

Answer 35

used with A1-ABO discrepancy

Question 36

where do you find whartons jelly

Answer 36

on cord blood cells

Question 37

why aren't reverse blood groupings done on newborns

Answer 37

no developed Abs

Question 38

define febrile nonhemolytic reaction

Answer 38

chills, fever, increase in temp by 2 degrees

Question 39

what could a weak supgroup of A cause

Answer 39

ABO discrepancy

Question 40

what would you use distinguish between an A1/A2 discrepancy?

Answer 40

dolichus Biflorus

Question 41

if the mother is O and the baby is A and there is HDN what would you transfuse with?

Answer 41

Group O blood

Question 42

what would be the next step if cord blood and mother sample have a strong + DAT?

Answer 42

elution

Question 43

would A2B and anti-A1 cause a discrepancy?

Answer 43

yes

Question 44

why are cells washed in the AHG test?

Answer 44

to prevent neutralization by globulins

Question 45

what is the reason for a mixed field result on a DAT for a patient who has been previously transfused

Answer 45

2 cell population in the patients blood

Question 46

what type of sample do you need for compatibility testing?

Answer 46

fresh serum/plasma

Question 47

why do you need a fresh serum sample for compatibilty

Answer 47

to preserve complement

Question 48

what type of elution is required for HDN

Answer 48

Acid Elution

Question 49

what is a cause for deferral during blood donation

Answer 49

if they tested positive for HBsAg