LabCorp Test

Anti-Streptolysin O Antibody (ASO) Blood Test

Quick Overview

Document exposure to streptococcal streptolysin O. A marked rise in titer or a persistently elevated titer indicates that a Streptococcus infection or poststreptococcal sequelae are present.

Test #006031


Availability: In stock

Also Known As Streptolysin-O Antibody; Strep A; ASO; Streptococcus, Group A; ASLO Test; ASOT; Antistreptolysin O Titer

Fasting for 6 hours required.

Test Results 1-2 days. May take longer based on weather, holiday or lab delays.

Anti-Streptolysin O Antibody is a blood test that measures the antibodies against a substance produced by group A streptococcus bacteria. 

This test is used if you have symptoms of a previous infection by group A streptococcus

Some illnesses caused by these bacteria are:

  • Bacterial endocarditis
  • Glomerulonephritis
  • Rheumatic fever
  • Scarlet fever
  • Strep throat

The ASO antibody may be found in the blood weeks or months after the strep infection has gone away.

A positive test result means you recently had a strep infection, even if you had no symptoms.

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