ANCA Vasculitides

The ANCA Vasculitides test contains 1 test with 2 biomarkers.

Testing for anti-neutrophil cytoplasmic antibodies (P-ANCA and/or C-ANCA) has been found to be useful in establishing the diagnosis of suspected vascular diseases (e.g., crescentic glomerulonephritis, microscopic polyarteritis and Churg-Strauss syndrome), bowel disease (Crohn's Disease, ulcerative colitis, primary sclerosing cholangitis, and autoimmune hepatitis) as well as with other autoimmune diseases (drug-induced lupus, SLE, Felty's syndrome). ANCA has classically been divided into C-ANCA and P-ANCA depending on the immunofluorescent pattern observed. More recently the specific antigens responsible for these patterns have been described and isolated. The antigen that gives the C-ANCA pattern is proteinase-3 (PR-3). Multiple antigens are responsible for P-ANCA pattern, the principle antigen being myeloperoxidase (MPO). Patients with vascular diseases will generally have either a C-ANCA pattern or P-ANCA pattern, and give positive results in specific tests for PR-3 or MPO. Patients with bowel disease have been shown to have antibodies that give a P-ANCA or C-ANCA pattern. These antibodies however, may not be directed towards MPO. Patients with drug induced lupus, etc., often present with a P-ANCA pattern that is associated with antibodies against MPO.

The following is a list of what is included in the item above. Click the test(s) below to view what biomarkers are measured along with an explanation of what the biomarker is measuring.

Also known as: ANCA, ANCA Panel for Vasculitis, Neutrophil Cytoplasmic Antibodies, Serum

Myeloperoxidase Antibody

Antineutrophil cytoplasmic antibodies (ANCA) are a group of autoantibodies produced when a person's immune system mistakenly targets and attacks its own neutrophil proteins. Two of the most commonly targeted proteins are myeloperoxidase (MPO) and proteinase 3 (PR3). This results in the production of antibodies to MPO and/or PR3. The ANCA blood test detects the presence or absence of these autoantibodies. Antineutrophil cytoplasmic antibodies may be present in a variety of autoimmune disorders that cause inflammation and damage to blood vessels throughout the body (systemic vasculitis). Vasculitis can cause tissue and organ damage due to the narrowing and obstruction of blood vessels and the subsequent loss of blood supply. It can also produce areas of weakness in blood vessel walls, known as aneurysms, which have the potential to rupture.

Proteinase-3 Antibody

*Process times are an estimate and are not guaranteed. The lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.