What is the normal value for anti-streptolysin O?
Under normal circumstances, the reference range for anti-streptolysin O (ASO) is 0–200 IU/mL. However, due to differences in testing reagents used among hospitals, the normal range may vary slightly. The detailed analysis is as follows:
Anti-streptolysin O is a serological immunological marker used to detect the body's immune response to streptococcal infection. ASO testing is commonly used in diagnosing streptococcal infections, particularly conditions such as pharyngitis and rheumatic fever. The normal reference range may vary depending on the laboratory and geographic region, but generally, a normal ASO level falls between 0 and 200 IU/mL. Elevated ASO levels may indicate a recent or ongoing streptococcal infection or a streptococcus-related autoimmune disorder.
If a patient is found to have abnormal ASO levels, prompt medical consultation is recommended to avoid delays in diagnosis and treatment.