• No fasting is required for this test. You may eat and drink normally unless advised otherwise.
• Inform the laboratory team about any medications you are taking, especially immunosuppressants or corticosteroids.
• Share details of symptoms such as chronic sinusitis, cough, breathing difficulty, or kidney-related issues.
• Inform your doctor about any known autoimmune disorders or recent infections.
• Carry your doctor’s prescription and valid ID proof at the time of sample collection.
• For repeat testing, maintain similar conditions to ensure consistency in results.

The C-ANCA (ELISA) test detects antibodies directed against proteinase 3 (PR3), a protein found in neutrophils. These antibodies can mistakenly target the body’s own tissues, leading to inflammation of blood vessels, a condition known as vasculitis.

The ELISA method provides a more precise measurement of antibody levels than indirect immunofluorescence. This makes it particularly useful for confirming diagnosis and monitoring disease activity.

Doctors commonly recommend the C-ANCA (ELISA) test to:

• Diagnose autoimmune vasculitis, such as granulomatosis with polyangiitis (GPA)
• Evaluate unexplained inflammation affecting multiple organs
• Monitor disease activity and treatment response
• Differentiate between types of ANCA-associated disorders
• Support diagnosis in patients with respiratory or kidney symptoms

The test involves collecting a small blood sample from a vein in the arm. The procedure is quick, safe, and minimally uncomfortable. Results are interpreted along with clinical findings and other investigations, such as p-ANCA, inflammatory markers, and imaging studies.

A positive result indicates the presence of PR3 antibodies, which are strongly associated with certain autoimmune conditions. However, diagnosis is based on a combination of laboratory findings and clinical evaluation.