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Fluorescent Immunoassay for Anti-Neutrophil Cytoplasmic Antibodies (ANCA) in Serum/Plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures specific antibodies found in your blood that target proteins in neutrophils, a type of white blood cell. These antibodies can be linked to certain autoimmune conditions affecting blood vessels.

Quick summary

["ANCA antibodies may indicate a rare but serious condition requiring prompt medical evaluation."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
92141-1
Short code
FLUBV RNA Resp Ql NAA+probe
Synonyms
FLUBV RNA Resp Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test if you have symptoms like persistent rash, kidney problems, lung issues, or unexplained inflammation. It helps identify whether your symptoms could be caused by ANCA-related vasculitis, a condition where inflammation damages blood vessels.

What to Expect During the Test

A small blood sample is drawn from your arm, similar to a routine blood test. The sample is then tested in a lab using a fluorescent immunoassay to detect ANCA antibodies. Results are typically available within 24–48 hours.

What the Results Mean

Positive results suggest the presence of ANCA antibodies, which may signal vasculitis or other autoimmune conditions. Negative results mean no detectable antibodies were found, but further testing may still be needed to diagnose other conditions.

Common Conditions Linked to ANCA

ANCA-related vasculitis can affect blood vessels in organs like the kidneys, lungs, or skin. Conditions like Wegener’s granulomatosis or microscopic polyangiitis are examples where this test plays a key role in diagnosis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Monitoring and Next Steps

Short name

ANCA Antibody Screening (FIA)

Frequently asked questions

If your results are positive, your doctor will likely recommend further testing, such as imaging or biopsies, to determine the exact type of vasculitis and guide treatment. Early diagnosis improves outcomes.
ANCA antibodies can sometimes be found in people without active disease, so follow-up may include additional blood tests or medical imaging to confirm a diagnosis.
What if my symptoms improve after testing?
If your symptoms improve or resolve, your doctor may still monitor you with periodic tests to ensure the condition doesn’t return. Treatment may include medications to reduce inflammation or immunosuppressants.
Does this test require fasting?
No fasting is required for this blood test. However, inform your doctor about any medications or supplements you take, as they may affect results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy