A physician orders an antistreptolysin O (ASO) titer test to check for rheumatic fever.A patient serum sample is exposed to known suspensions of streptolysin and then allowed to incubate with RBCs.If the patient does have rheumatic fever, what will happen?
A)Not enough information is provided to speculate.
B)The red blood cells will lyse.
C)The red blood cells will agglutinate only.
D)The red blood cells will not lyse.
E)The red blood cells will fluoresce.

Question

Quizplus · Accepted Answer

If the patient has rheumatic fever, the ASO titer test will show a rise in the level of antibodies against streptolysin, which is a toxin produced by the streptococcus bacteria that causes strep throat. The patient's serum sample will not cause the lysis or agglutination of red blood cells, but the test will measure the level of antibodies to determine if there has been exposure to streptolysin. Therefore, the correct answer is D, the red blood cells will not lyse.

A Physician Orders an Antistreptolysin O (ASO) Titer Test to Check