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Anti-Streptolysin O Titre (ASOT), Serum

Test ID: ASOT
Test
Specimen
Performance / Interpretation
Interface / Setup

Test

Aliases/Synonyms

ASOT

Method

Latex Agglutination

Report Includes

Anti-Streptolysin O Titre

Specimens

Serum

Clinical Utility

Acute and convalescent sera (10 – 14 days after onset of illness) should be analyzed to document acute infection.

Test Location

Hospital for Sick Children, 555 University Avenue, Toronto ON M5G 1X8

Test Version

5-May-2023

Specimen

Specimens

Serum

Collection Containers

Gold Top (clot actiator & gel)

Sample Volume

3 mL

Minimum Volume

1.2 mL

Collection & Handling

Handling Information

Store and send cold or frozen.

Stability

Refrigerated 8 days
Frozen Over 8 days

Test Version

5-May-2023

Performance / Interpretation

Method

Latex Agglutination

Turnaround Time

5 days

Results

Name Units Reference Range Conversion Factor
Anti-Streptolysin O Titre IU/mL
  • Adults 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.

Test Location

Hospital for Sick Children, 555 University Avenue, Toronto ON M5G 1X8

Test Version

5-May-2023

Interface / Setup

HL7 Interface Codes

Order Code Result Codes Units
ASOT 27365Anti-Streptolyson O titre (ASOT)

Test Version

5-May-2023