What is the normal value for anti-streptolysin O?
May 16, 2023
Source: Cainiu Health
Dr. Liu Aihua
Introduction
The normal range for anti-streptolysin O is typically 0 U/mL to 200 U/mL. Anti-streptolysin O is an antibody produced by the human body, used to assess streptococcal infection. Levels above the normal range may indicate a past streptococcal infection. Streptococcal infections often cause various symptoms and require comprehensive evaluation based on clinical presentation and medical history.
Under normal circumstances, the reference range for anti-streptolysin O (ASO) is typically 0 U/mL to 200 U/mL. Specific details are as follows:
Anti-streptolysin O is an antibody produced by the human body, with a normal value generally ranging from 0 U/mL to 200 U/mL. It acts against streptolysin O, a toxin produced by streptococcus bacteria. Measuring ASO levels can help assess whether a streptococcal infection has occurred. Elevated ASO levels beyond the normal range may indicate a past streptococcal infection. Streptococcal infections commonly cause pharyngitis, tonsillitis, otitis media, and skin infections; in severe cases, they may lead to complications such as rheumatic fever and nephritis. Additionally, certain autoimmune diseases and other infections may also result in increased ASO levels. However, elevated ASO levels do not necessarily indicate an active streptococcal infection—they may represent evidence of a prior infection or persist above normal levels even after recovery.
Therefore, relying solely on ASO levels for diagnosing streptococcal infection is unreliable. A comprehensive evaluation combining clinical symptoms, other laboratory tests, and patient history is necessary for accurate diagnosis.
