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Anti-Streptolysin O
MessageFor Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.
Test Code
ASO
Alias/See Also
265;
Antistreptolysin O;
ASO;
ASO Quant;
ASO Titer;
Streptolysin-O;
Streptolysin-O-Titer;
Antistreptolysin O;
ASO;
ASO Quant;
ASO Titer;
Streptolysin-O;
Streptolysin-O-Titer;
CPT Codes
86060
Preferred Specimen
serum
Minimum Volume
0.5 mL
Instructions
Barrier tubes (serum separator tubes) are preferred. If non-barrier tubes are utilized, the serum must be removed immediately after centrifuging and placed in a screw-cap transfer tube. Collection notes: Avoid hemolysis. Invert tubes at least 8 times. Allow to clot in an upright position for 30 minutes. Within 2 hours, centrifuge tubes 10 minutes. Keep tightly stoppered. Do NOT re-centrifuge tubes. Do NOT freeze the primary collection tube.
Transport Container
Original tube preferred, may be sent in a screw-top transfer tube.
Transport Temperature
Room Temperature or Refrigerated
Specimen Stability
Room Temperature = 2 days
Refrigerated = 2 days
Frozen = 6 months
Refrigerated = 2 days
Frozen = 6 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis, Lipemia, incorrect specimen type, insufficient sample volume, improper storage conditions, exceeds specimen stability guidelines, contaminated sample.
Methodology
Immunoassay
Setup Schedule
24/7
AU
AU
Report Available
1 day
Clinical Significance
ASO is a sensitive test for recent streptococcal infection. A rise in ASO begins about one week after infection and peaks two to four weeks later. ASO levels do not rise with cutaneous infections. In the absence of complications or reinfection, the ASO level will fall to preinfection levels within 6 to 12 months.
Performing Laboratory
Compunet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine, OH 45439
Last Updated: November 19, 2021
