Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test
About Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test
| Field | Value |
|---|---|
| Also Known As | ANCA Antibodies by IFA, ANCA by Immunofluorescence, c-ANCA, p-ANCA, Cytoplasmic Neutrophil Antibodies, Anticytoplasmic Autoantibodies |
| Sample Type | Venous blood (serum) |
| Fasting Required | No fasting required |
| Report Time | 3 to 5 days |
| Recommended For | Adults and children of all genders with suspected autoimmune vasculitis |
| Price | Starting at ₹3,500 |
What Is an Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test?
The Antineutrophil Cytoplasmic Antibodies via IFA test checks for specific antibodies in your blood that can attack your own white blood cells. These antibodies, called ANCAs, are linked to a group of autoimmune conditions that cause blood vessel inflammation. Doctors order this test when they suspect an autoimmune or inflammatory condition. It is also known as the ANCA Antibodies by Immunofluorescence test or the Anticytoplasmic Autoantibodies test. A blood sample drawn from a vein is used for this test.
What Does an Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test Measure?
This test uses a technique called indirect immunofluorescence (IFA) to identify ANCA antibodies and classify them by their staining pattern on white blood cells. The following parameters are assessed:
| Parameter | What It Means |
|---|---|
| c-ANCA (Cytoplasmic pattern) | Antibodies that stain throughout the cell; usually target an enzyme called proteinase 3 (PR3) |
| p-ANCA (Perinuclear pattern) | Antibodies that stain around the cell nucleus; usually target an enzyme called myeloperoxidase (MPO) |
| Atypical ANCA | A mixed pattern that shows features of both cytoplasmic and perinuclear staining |
| Antibody titre (dilution level) | The concentration of antibodies present, measured across dilutions from 1:20 to 1:1280 when a positive pattern is found |
Why Is an Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test Done?
This test is used to investigate unexplained symptoms that may point to blood vessel inflammation or autoimmune disease.
Common Symptoms That May Require This Test
A doctor may recommend the ANCA Antibodies by Immunofluorescence test if you have one or more of the following symptoms:
- Persistent or unexplained fever
- Significant unintended weight loss
- Ongoing fatigue with no clear cause
- Joint pain or swelling
- Skin rash or unusual skin changes
- Blood or protein detected in urine
- Signs of generalised inflammation
Conditions This Test Can Help Detect
The Anticytoplasmic Autoantibodies test can help identify a range of autoimmune and inflammatory conditions. These include:
- Granulomatosis with polyangiitis (GPA), previously called Wegener's granulomatosis
- Microscopic polyangiitis (MPA)
- Eosinophilic granulomatosis with polyangiitis (EGPA)
- Inflammatory bowel diseases, particularly ulcerative colitis
- Drug-induced vasculitis (blood vessel inflammation caused by certain medicines)
- Kidney inflammation (glomerulonephritis) linked to vasculitis
Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test for Chronic Disease Monitoring
Once a diagnosis of ANCA-associated vasculitis has been made, regular ANCA testing is part of routine clinical care. Antibody levels tend to fall during treatment, and monitoring these levels helps doctors assess how well treatment is working. In patients with PR3-ANCA, relapse rates over five years are higher than in those with MPO-ANCA, making ongoing testing especially useful for tracking disease activity over time.
How to Prepare and What to Expect
No special preparation is needed for this test, but a few simple steps will help ensure a smooth experience.
Do You Need to Fast?
No, fasting is not required before the Antineutrophil Cytoplasmic Antibodies via IFA test. You can eat and drink normally before your appointment. If your doctor has ordered other tests at the same time, check whether any of those require fasting.
Practical Tips Before Your Test
Keep the following points in mind before going for your sample collection:
- Tell your doctor about all medicines, supplements, or herbal remedies you are currently taking.
- Specifically mention if you are taking drugs such as propylthiouracil, hydralazine, minocycline, or carbimazole, as these are linked to false positive results.
- Drink enough water so your veins are easy to locate.
- Wear a short-sleeved or loose-sleeved top for easy access to your arm.
- Let the phlebotomist know about any allergies or prior reactions to blood draws.
Step-by-Step Procedure
Here is what typically happens during sample collection and processing:
- The phlebotomist ties a band around your upper arm to make the vein more visible, then cleans a small area near your inner elbow.
- A thin needle is inserted into the vein. You may feel a brief sting or pinch. A small tube collects the blood sample.
- The band and needle are removed. Light pressure is applied to the puncture site, and a small bandage is placed on it.
- In the laboratory, your blood sample is placed on a slide with white blood cells. If ANCA antibodies are present, they attach to these cells.
- The slide is treated with fluorescent antibodies. Under a microscope, the pattern of fluorescence reveals whether c-ANCA, p-ANCA, or atypical ANCA are present.
- The sample is sent to a specialist laboratory for analysis. Results are typically available within 3 to 5 days.
Factors That Can Affect Accuracy
Several factors may influence the reliability of the result:
- Certain medicines (see the list above) that can trigger a positive result unrelated to vasculitis
- The presence of antinuclear antibodies (ANA), which occur in other autoimmune conditions, can interfere with the reading
- Poor sample handling or delays between collection and processing
- Dehydration, which can make sample collection more difficult
- Laboratory expertise and the quality of the fluorescence technique used
Understanding Your Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test Results
Your results should always be reviewed with your doctor, who will consider them alongside your symptoms, medical history, and other test findings. The table below shows standard reference ranges for the ANCA Antibodies by Immunofluorescence test:
| Result | Range | What It May Indicate |
|---|---|---|
| Negative | Less than 1:20 | No ANCA antibodies detected |
| Positive | Greater than 1:20 (titre reported) | Antibodies present; pattern (c-ANCA, p-ANCA, or atypical) is also reported |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain situations can affect how results are interpreted:
- Several medicines, including propylthiouracil, hydralazine, and minocycline, can cause drug-induced ANCA-associated vasculitis. A positive result in a patient taking these drugs may reflect a medication effect rather than primary vasculitis.
- Antinuclear antibodies (ANA), which are present in conditions such as systemic lupus erythematosus (SLE), can produce a pattern that resembles p-ANCA. Repeat testing on a formalin-fixed slide helps distinguish the two.
- Positive ANCA results can occur in conditions such as ulcerative colitis, infective endocarditis, tuberculosis, and cystic fibrosis.
How to Maintain Healthy Levels
While there are no lifestyle changes that directly prevent ANCA antibody formation, the following general habits support overall immune health:
- Eat a balanced diet with plenty of vegetables, whole grains, and lean protein to support immune function.
- Get adequate sleep and manage stress, as chronic stress can affect immune regulation.
- Attend all follow-up appointments if you are being monitored for vasculitis, so your doctor can track any changes in your ANCA levels over time.
Lupin Diagnostics Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test Price and Home Collection
The Anticytoplasmic Autoantibodies test is available at Lupin Diagnostics with prices starting at approximately ₹3,500. Home sample collection is available for this test.
| Lab or City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹3,500 |
| Pune | ₹3,500 |
| Chennai | ₹3,500 |
| Bengaluru | ₹3,500 |
| Hyderabad | ₹3,500 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home sample collection for the Antineutrophil Cytoplasmic Antibodies via IFA test across cities, making it convenient to get tested without visiting a centre. All samples are processed in NABL-accredited laboratories by trained technologists. Your digital report is delivered directly to your email or WhatsApp once ready.
Frequently Asked Questions
This test checks your blood for antineutrophil cytoplasmic antibodies (ANCA). These are antibodies produced by the immune system that mistakenly attack healthy white blood cells called neutrophils. Their presence can indicate autoimmune vasculitis, a condition that causes blood vessel inflammation.
The two patterns reflect different antibody targets. The c-ANCA pattern (cytoplasmic) is usually associated with antibodies against proteinase 3 (PR3) and is strongly linked to granulomatosis with polyangiitis (GPA). The p-ANCA pattern (perinuclear) is typically linked to antibodies against myeloperoxidase (MPO) and is associated with microscopic polyangiitis and other conditions.
Yes, a positive result does not automatically confirm vasculitis. Positive ANCA results can occur in other conditions such as ulcerative colitis, tuberculosis, infective endocarditis, and in patients taking certain medicines. Your doctor will interpret the result alongside your full clinical picture.
When the test result is positive, the laboratory measures the concentration of antibodies by testing progressively diluted samples. A higher dilution number (such as 1:640) means more antibodies are present compared to a lower one (such as 1:40). The titre can help monitor how antibody levels change during treatment.
No fasting is needed. You can eat and drink as usual before the test. However, if your doctor has ordered other tests at the same time, some of those may require fasting, so it is worth checking in advance.
Yes. In patients already diagnosed with ANCA-associated vasculitis, regular testing is used to track how the condition responds to treatment. Antibody levels generally fall during effective treatment, and a rise in levels may signal a possible relapse, though this does not apply to every patient.
Antineutrophil Cytoplasmic Antibodies, IFA in Dilutions Test
