Anti-Streptolysin O Antibody (ASO)

Formal Name of the Test:
Anti-Streptolysin O Antibody (ASO)

Other Names Used:
Streptococcus, Group A, ASLO Test, ASOT,  Antistreptolysin O Titer, Streptolysin-O Antibody, Strep A, ASO

Sample Required:
Serum

Test Overview:
This test is highly sensitive for detecting recent streptococcal infection. ASO levels begin to rise about one week after infection and reach a peak two to four weeks later. ASO levels do not rise in response to cutaneous infections. If no complications or reinfection occur, the ASO level will return to preinfection levels within 6 to 12 months. ASO levels are elevated in more than 80% of patients with acute rheumatic fever and 95% of patients with acute glomerulonephritis caused by streptococci.

Test Preparation:
Fasting for 6 hours is required

Test Performed at:
Quest Diagnostics, Test Code 265 

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