2S [LAB]: ASO

Question 1

Principle of Anti-Streptolysin O titer test (tube test)

Answer 1

Neutralization

Question 2

Principle of Anti-Streptolysin O slide test

Answer 2

Indirect/ passive agglutination

Question 3

Positive result for ASO test

Answer 3

Absence of hemolysis

Question 4

ASO titer that is considered normal

Answer 4

166 Todd units

Question 5

ASO titer that is considered moderately elevated

Answer 5

at least 240 Todd units (adult)
at least 320 Todd units (child)

Question 6

Concentration of the red cell suspension used for ASO test

Answer 6

5% O red cells or rabbit’s blood

Question 7

Positive result for ASO latex slide test

Answer 7

Agglutination

Question 8

Principle of Streptozyme test

Answer 8

Passive hemagglutination

Question 9

Positive result for Streptozyme test

Answer 9

Agglutination

Question 10

Method commonly used in diagnosing recent post-streptococcal sequelae infections

Answer 10

Streptozyme test

Question 11

Reagent used in Streptozyme Test

Answer 11

Aldehyde-fixed sheep red cells