Proteinase 3 Antibodies
Private Proteinase 3 Antibodies testing in London for £92.99, measuring one PR3 autoimmune marker with results expected in around 5 days.
Turnaround time
5 business days
Biomarkers count
1
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Overview of the Proteinase 3 Antibodies Test
The Proteinase 3 Antibodies blood test measures autoantibodies directed against Proteinase 3, or PR3, an enzyme found within neutrophils.
The test assesses 1 specialist autoimmune biomarker: Proteinase 3 Ab.
PR3 antibodies are one of the principal antigen-specific antibodies associated with ANCA-associated vasculitis.
They are particularly associated with granulomatosis with polyangiitis, commonly abbreviated to GPA.
GPA is an autoimmune disorder in which inflammation damages small and medium-sized blood vessels.
It can affect several organs.
The upper airways, sinuses, lungs and kidneys are particularly important.
PR3 antibodies are often associated with a cytoplasmic ANCA pattern, known as c-ANCA, although antigen-specific PR3 measurement provides more precise information than the staining pattern alone.
A positive PR3 result does not independently diagnose vasculitis.
Clinical symptoms, urine testing, kidney function, inflammatory markers, imaging and occasionally biopsy are required.
PR3 antibodies can occasionally be detected in other inflammatory or infectious conditions.
Some people with genuine ANCA-associated vasculitis are also PR3-negative.
Myeloperoxidase Antibodies, or MPO, represent the other major ANCA antigen specificity and are more strongly associated with microscopic polyangiitis and some other vasculitic syndromes.
PR3 can also be followed during treatment in selected patients, although antibody concentration does not always correspond perfectly with disease activity.
What Does the Proteinase 3 Antibodies Test Check?
The test measures antibodies directed against Proteinase 3. This test measures 1 specialist biomarker.
Proteinase 3 Ab
Measures PR3-specific autoantibodies associated particularly with granulomatosis with polyangiitis and other ANCA-associated vasculitic disorders.
Who May Benefit From the Proteinase 3 Antibodies Test?
PR3 testing can be useful where symptoms or other results raise concern about ANCA-associated vasculitis.
People with persistent sinus or nasal inflammation and systemic symptoms - GPA commonly affects the upper respiratory tract.
People with unexplained blood or protein in urine - Kidney involvement can occur with small-vessel vasculitis.
People with rapidly declining kidney function - ANCA-associated glomerulonephritis requires urgent assessment.
People with unexplained lung infiltrates or coughing blood - Pulmonary vasculitis can cause serious respiratory complications.
People with a positive ANCA result - PR3 helps identify the antigen specificity.
People with inflammatory symptoms affecting several organ systems - Systemic vasculitis can have a broad presentation.
People with a previous positive PR3 result - Repeat measurement may form part of specialist monitoring.
People referred by rheumatology or nephrology - PR3 is a key targeted vasculitis antibody.
How to Prepare
Do not stop immunosuppressive treatment solely to increase antibody detection.
PR3 should be interpreted alongside the full clinical picture and organ-function testing.
Symptoms and Reasons to Consider the Proteinase 3 Antibodies Test
ANCA-associated vasculitis can affect multiple organs and the symptoms vary considerably between people.
Persistent sinusitis or nasal crusting - Upper-airway inflammation is common in GPA.
Frequent nosebleeds with chronic nasal inflammation - Vasculitic ENT disease can damage nasal tissues.
Blood in the urine - Kidney inflammation can cause haematuria.
Unexplained protein in the urine - Glomerular injury can allow protein leakage.
Cough, breathlessness or abnormal lung imaging - GPA can affect pulmonary tissue.
Coughing blood - Pulmonary haemorrhage is a serious possible complication.
Unexplained fatigue, fever or weight loss with inflammation - Systemic vasculitis can cause constitutional symptoms.
Joint or muscle pain alongside organ abnormalities - Multisystem inflammation can occur.
Coughing blood, rapidly declining kidney function, severe breathlessness or other signs of major organ involvement require urgent medical assessment.
ANCA-associated vasculitis can cause irreversible organ damage if treatment is delayed.
How to Book Your Proteinase 3 Antibodies Test
The Proteinase 3 Antibodies test can be booked privately for targeted ANCA-associated vasculitis assessment.
Choose the Proteinase 3 Antibodies
Select the individual PR3 antibody blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy where suitable.
Attend your appointment
A trained healthcare professional collects the required venous blood sample.
Laboratory analysis
Your serum undergoes measurement of Proteinase 3 Ab.
Receive your results securely
Your authorised result is delivered securely and can be interpreted alongside ANCA, MPO, kidney results and other investigations.
When Will I Receive My Results?
The current London Blood Tests page lists a turnaround of approximately 5 days after laboratory receipt for Proteinase 3 Antibodies.
The sample undergoes specialist autoimmune antibody analysis, laboratory quality control and authorisation.
Occasional repeat or confirmatory analysis can extend reporting.
Understanding Your Results
A negative PR3 result means significant Proteinase 3 antibodies were not detected.
This reduces the likelihood of PR3-associated vasculitis but does not exclude ANCA-associated disease completely.
A positive result indicates detectable PR3 autoantibodies.
Strong positivity in somebody with compatible clinical features can provide important support for granulomatosis with polyangiitis.
The antibody result still requires clinical correlation.
A person can have PR3 antibodies without currently having severe active vasculitis.
Likewise, antibody concentrations can remain detectable even after treatment.
PR3 results should therefore be interpreted with ANCA pattern, MPO antibodies, inflammatory markers, kidney function, urine findings and imaging where appropriate.
Why Book With London Blood Tests?
London Blood Tests provides private PR3 testing for focused assessment of ANCA-associated autoimmune disease.
Measures PR3-specific autoantibodies - The test directly assesses antibodies against Proteinase 3.
Strongly associated with GPA - PR3 is an important marker in granulomatosis with polyangiitis.
Useful after a positive ANCA result - Antigen-specific testing clarifies the antibody target.
Relevant to kidney and lung vasculitis - These organs can be seriously affected by ANCA-associated disease.
Can complement MPO testing - PR3 and MPO represent the major ANCA antigen specificities.
Can contribute to specialist monitoring - Serial results can provide additional context in selected patients.
Professional blood collection - Clinic and suitable home or hotel appointments are available.
Clear pricing - The Proteinase 3 Antibodies test costs £92.99.
Private Proteinase 3 Antibodies Blood Test in London
London Blood Tests provides private Proteinase 3 Antibody testing for people requiring assessment of ANCA-associated vasculitis.
The test costs £92.99 and measures 1 specialist biomarker: Proteinase 3 Ab.
Results are expected approximately 5 days after laboratory receipt.
A positive result supports autoimmune vasculitis assessment but does not establish the diagnosis independently.