Test Overview
Clinical Utility
Acute and convalescent sera (10 – 14 days after onset of illness) should be analyzed to document acute infection.
Method
Latex agglutination assay
Result Included
Anti-Streptolysin O Titre
Aliases/Synonyms
ASOT
Specimen
Specimen Type
SerumContainers
Collection Containers
Gold Top (clot actiator & gel)
Volume
Sample Volume
3 mL
Minimum Volume
1.2 mL
Collection & Handling
Handling Information
Store and send cold or frozen.
Stability
| Refrigerated | Frozen |
|---|---|
| 8 days | Over 8 days |
Performance & Interpretation
Turnaround Time
5 days
Results
Name
Units
Reference Range
Conversion
-
Anti-Streptolysin O TitreIU/mLAdults and Children ≥3 y: Negative <200
Children ≤3 y: Negative <50
A 4-fold rise or fall-in antibody titre is compatible with a recent streptococcal infection. The peak ASOT is usually achieved 3 to 5 weeks post infection, then declines over the next 6 to 8 weeks.
Referral Location
Canada
Interface & Setup
HL7 Interface Codes
| Order Code | Result Name | Result Codes | Units |
|---|---|---|---|
| ASOT | Anti-Streptolyson O titre (ASOT) | 27365 |
Test Version
Last Updated
2023-05-05