Antistreptolysin O
Label Mnemonic: ASO
Epic code: LAB688
Downtime form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Commercial Mail-out Laboratory
5231 RCP
Specimen Instructions:
Separate serum from cells as soon as possible.
Collection Medium:
Red top tube 5 mL (Clot Activator)
Preferred Minimum: 1 mL serum in a red top tube
Absolute Minimum: 0.4 mL serum in a red top tube
Rejection Criteria:
Heparinized plasma. Hemolyzed specimens.
Delivery Instructions:
Submit specimen to laboratory as soon as possible after collection.
Turn Around Time:
Within 24 hours upon receipt at reference laboratory
Reference Range:
0-1 year: 0-200 IU/mL
2-12 years: 0-240 IU/mL
13 years and older: 0-330 IU/mL
Use of antistreptolysin O (ASO) for the diagnosis of acute group A streptococcal infection is rarely indicated. False negative results are common. Dnase B Antibody(LAB3020) is the recommended adjunct test for patients with suspected non-purulent complications of Group A streptococcal infection.
Quantitative Nephelometry
CPT Code:
See also:
Dnase B Antibody, Serum