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Lab Test

Anti-PR3 Antibodies - cANCA Test

Anti-PR3 antibodies, also known as c-ANCA (cytoplasmic Anti-Neutrophil Cytoplasmic Antibodies), are antibodies that target a protein called Proteinase 3 (PR3) found in neutrophils. Neutrophils are a type of white blood cell that plays a critical role in the immune system's defense against infections. The Anti-PR3 antibodies test is used to help diagnose certain autoimmune disorders, particularly Granulomatosis with Polyangiitis (GPA), formerly known as Wegener's Granulomatosis. GPA is a rare disorder characterized by inflammation of blood vessels (vasculitis), which can affect various organs including the kidneys, lungs, and upper respiratory tract.


  • Profile Name: Anti-PR3 Antibodies - cANCA Test
  • Sample Type: Blood
  • Preparations Required: No special preparation is needed for this test.
  • Report Time: 6 hours

What is the Anti-PR3 antibodies - cANCA test?

The Anti-PR3 antibodies - cANCA test is a blood test that detects antibodies against the Proteinase 3 (PR3) enzyme in neutrophils. It is used to help diagnose Granulomatosis with Polyangiitis (GPA) and other vasculitis disorders.

Why is the Anti-PR3 antibodies - cANCA test important?

This test is important for diagnosing and monitoring diseases like Granulomatosis with Polyangiitis, which can have serious complications if not treated. Early diagnosis and treatment can prevent organ damage and improve prognosis.

Home Sample Collection Process

1
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Book your convenient slot
2
Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
3
Reporting of the sample at lab
Reporting of the sample at lab
4
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Frequently Asked Questions

Symptoms of GPA may include fatigue, fevers, joint pain, sinus congestion, shortness of breath, blood in the urine, and skin sores or rashes.

GPA is generally treated with medications that suppress the immune system, such as corticosteroids and immunosuppressive drugs. This helps to reduce inflammation and prevent damage to organs.

A positive result suggests the presence of Anti-PR3 antibodies in the blood, which is associated with GPA and some other forms of vasculitis. It is important to interpret these results along with clinical symptoms and other laboratory findings.

Yes, it is possible for a person to have GPA with a negative Anti-PR3 antibodies test. In such cases, other tests and clinical evaluation are important for diagnosis.

There are no known modifiable factors for the presence of Anti-PR3 antibodies, as these antibodies are often produced by the immune system in response to an autoimmune trigger.

Non-modifiable factors include genetic predisposition to autoimmune diseases.

Other tests that might be done include blood tests for kidney function, imaging tests like X-rays or CT scans, and sometimes a tissue biopsy.

Testing for Anti-PR3 antibodies should be done if a person has symptoms suggestive of GPA or other forms of vasculitis, especially if there is unexplained kidney dysfunction or lung abnormalities.

The frequency of testing depends on the clinical situation and should be determined by the doctor overseeing the patient’s care.

In case of abnormal Anti-PR3 antibodies levels, consultation with a rheumatologist or a nephrologist is advised.

No, fasting is not necessary for the Anti-PR3 antibodies test.

Neutrophils are white blood cells that usually help fight infections. However, in autoimmune disorders, proteins within neutrophils can be mistakenly targeted by the immune system, leading to inflammation and damage to tissues and organs.

Yes, immunosuppressive medications used to treat GPA and other autoimmune disorders can reduce the level of Anti-PR3 antibodies.

Detection of Anti-PR3 antibodies can be pivotal in diagnosing and managing autoimmune diseases like Granulomatosis with Polyangiitis. A collaborative approach involving a patient and their healthcare team, including a rheumatologist or nephrologist, is essential in effectively managing the condition. Prompt diagnosis and treatment are key to preventing organ damage and improving quality of life for patients with GPA and related conditions.

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