Low Anti-centromere antibody (ACA): what it means
A Anti-centromere antibody (ACA) result below the normal range is considered low. Here is what a reduced Anti-centromere antibody (ACA) can point to, and when it is worth discussing with a doctor.
Reference range: Typically <7 U/mL negative (assay-dependent); a positive result is strongly associated with limited cutaneous systemic sclerosis (the CREST pattern), and flags a risk of pulmonary hypertension
Understand your full resultWhat a low Anti-centromere antibody (ACA) can mean
- Negative — the expected result; makes anti-centromere-associated limited scleroderma unlikely, though other scleroderma antibodies (such as anti-Scl-70) can still be positive.
When to discuss with a doctor
Anti-centromere antibody is tested when systemic sclerosis is suspected — often prompted by Raynaud's phenomenon with skin tightening of the fingers, reflux or dilated skin vessels, and a positive ANA. A positive result supports the limited (CREST) form of the disease and, importantly, flags a raised long-term risk of pulmonary hypertension, so it prompts a rheumatologist to arrange periodic heart and lung screening (such as echocardiography). The diagnosis and the monitoring plan are made by the specialist using the whole clinical picture, not the antibody alone. Mediora.AI can surface a positive anti-centromere antibody alongside ANA so the limited-scleroderma pattern is visible in your results, but confirming the diagnosis and managing the pulmonary risk belongs with your doctor and rheumatologist.
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