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Antibody Screening for Anti-Neutrophil Cytoplasmic Antibodies (ANCA) by Immunofluorescence

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

This test helps detect antibodies that may be linked to certain autoimmune conditions affecting blood vessels, such as vasculitis.

Quick summary

["This screening can help identify potential inflammatory or autoimmune disorders that may require further evaluation."]

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

Key facts at a glance

LOINC
31627-3
Short code
ENA SM Ab Ser Ql
Synonyms
ENA SM Ab Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might Be Ordered

Your doctor may recommend this test if you have symptoms like unexplained skin rashes, joint pain, kidney problems, or unexplained bleeding, especially when other causes have been ruled out. It’s also used in cases where doctors suspect conditions like Wegener’s granulomatosis or microscopic polyangiitis.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein in your arm by a healthcare professional. You may feel a brief pinch or discomfort, but it usually takes only a few minutes.

What the Test Results Mean

Results are qualitative (positive or negative). A positive screening result means antibodies were detected and may warrant further testing, such as confirmation or specific antibody profiling, to narrow down potential diagnoses.

Common Conditions Linked to Positive Results

Positive results are often associated with autoimmune diseases that target blood vessels, such as vasculitis. These conditions can affect organs like the kidneys, lungs, or skin and may require prompt medical attention.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

ANCA Screening (Serum)

Frequently asked questions

What does a positive screening result mean?
A positive result indicates the presence of ANCA antibodies in your blood, which may suggest an underlying inflammatory or autoimmune condition. Your doctor will likely order additional tests to identify the specific type of vasculitis or other conditions that may be causing your symptoms.
Can ANCA antibodies be normal in some people?
Yes, ANCA antibodies can be found in some healthy individuals or people without active disease. However, their presence in someone with symptoms of vasculitis or related conditions is more concerning and warrants further investigation.
How soon will I get my results?
Results are typically available within a few days to a week, depending on your lab’s processing time. Your healthcare provider will discuss the results with you and explain next steps, if needed.
  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