Antistreptolysin O FS

Product Number: 1 7012


Antistreptolysins (ASL) are specific antibodies to extracellular products of Streptococcus pyogenes (Group A streptococcus: GAS), among which antistreptolysin O (ASO) is the one most used for clinical laboratory evaluation. Antistreptolysin O determination provides useful information for the diagnosis and monitoring of human streptococcal infections such as tonsillitis, otitis, erysipelas, and scarlet fever as well as connected diseases like rheumatic fever or glomerulonephritis. Antibodies against streptolysin O can be detected 1 – 3 weeks after infection with maximum levels reached at 3 – 6 weeks. Pathological ASO values always indicate the presence of a streptococcal infection whereas a negative result cannot exclude an existing or preceding GAS infection.


Ready to use reagent.

Proline Antistreptolysin O FS comes in a liquid format which provides convenience for users as no reconstitution is required which helps reduce the risk of misdiagnosis.

Open system reagent, compatible with a wide range of instruments.

Proline Antistreptolysin O FS reagent is suitable for various third-party analyzers such as Abbott, Advia, Cobas, Hitachi, Olympus, Response, TokyoBoeki, and Beckman Coulter. Please contact our technical support at for further compatibility information on other types of analyzers.


  • Immunoturbidimetric test (Particle enhanced)
  • No effect of prozone was observed up to an ASO concentration of 1500 IU/mL.
  • No interference: ascorbic acid 30 mg/dL, bilirubin 40 mg/dL, hemoglobin 500 mg/dL, lipemia to triglycerides 2000 mg/dL
  • Measurement range from 7-800 IU/mL with a lower limit of detection of 7 IU/mL


  • TruCal ASO


Kit Lines

No. Catalog R1 R2 Kit Size
1 7012 99 88 021 5 x 25 mL 1 X 25 mL Multi Purpose Kit
1 7012 99 88 921 4 X 16 mL 4 X 3 mL Proline® R-910

Reference Range

Antistreptolysin O (ASO) is used for diagnosis and monitoring of human streptococcal infections.

 Adults ≤ 200 IU/mL
Childern ≤ 150 IU/mL

Each laboratory should check whether the reference range can be calculated for its patient population and determine its own reference range if necessary.


  • Inflamation

Order information

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Technical Support

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  • Phone. +6221 8984 2722
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