Scl-70

The Scl-70 test detects the presence of antibodies against the topoisomerase I enzyme, which plays a role in DNA replication and repair. The presence of these antibodies are associated with systemic sclerosis (SSc), also known as scleroderma. The test can help diagnose SSc, predict the risk of complications, and differentiate SSc from other similar autoimmune conditions. A positive test result suggests that the immune system may be attacking this enzyme, which can lead to tissue damage and fibrosis. A negative result typically means that these antibodies are not present, making systemic sclerosis less likely, though it doesn’t completely rule it out. Additional tests may be needed to confirm a diagnosis or explore other possible autoimmune conditions.