Antistreptolysin (ASO) antibodies-13334
Test info
Document exposure to Streptococcal streptolysin O
Specimen
Submission of the minimum volume does not allow for repeat testing
Immediatley following collection, mix sample by gently inverting 5 times
- Allow sample to clot for a minimum of 30 minutes
- Spin within two (2) hours of sample collection
Gold serum separator (SST) tube
- Allow sample to clot
- Spin
- Transfer serum to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as serum, within two (2) hours of sample collection
Ambient (preferred) - 14 days
Refrigerated - 14 days
Frozen - 14 days
Freeze/thaw cycles - stable x 3
- Gross hemolysis
- Lipemia
Performance
Latex immunoturbidimetry
Clinical and Interpretive info
0.0 - 200.0 IU/mL
A marked rise in titer or a persistently elevated titer indicates that a Streptococcus infection or poststreptococcal sequelae are present. Streptolysin is a hemolysin produced by group A streptococci. In an infected individual streptolysin O acts as a protein antigen, and the patient mounts an antibody response. A rise in antibody level begins about 1 week after infection and peaks 2-3 weeks later. In the absence of complications or reinfection, the ASO titer will usually fall to preinfection levels within 6-12 months. Both clinical and laboratory findings should be correlated in reaching a diagnosis.