Basic

Question 1

False positive results when using cassettes may result from:

Repeat Mistake

Answer 1

Under centrifugation

Fibrin clots in serum

Question 2

False negative results when using cassettes may result from:

Repeat Mistake

Answer 2

Over centrifugation

Question 3

Discrepancies between forward & reverse ABO grouping could be resolved through :

Answer 3

Repeating the test
Antibody screening
Allowing more incubation

Question 4

Disadvantages of slide technique for blood grouping include:

Answer 4

Missing of weak expressions of A & B antigens Missing of weak/variant D antigen
Not suitable for reverse grouping

Question 5

Discrepancies between forward & reverse ABO- blood grouping may occur due to:

Answer 5

Procedural errors
A & B subgroups
Irregular antibodies in patient’s serum