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Antibody Titration for ENA (Extractable Nuclear Antigen) Autoantibodies (Serum)

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

This test measures antibodies against ENA proteins, which may help identify certain autoimmune conditions affecting the kidneys or connective tissues.

Quick summary

["This test helps diagnose autoimmune diseases by detecting specific antibodies in your blood."]

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

Key facts at a glance

LOINC
9722-0
Short code
ENA SM Ab Titr Ser
Synonyms
ENA SM Ab Titr Ser
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 Is Done

Your healthcare provider may order this test if you have symptoms like joint pain, rash, kidney issues, or unexplained fatigue. It’s often used in patients suspected of having conditions like lupus, scleroderma, or mixed connective tissue disease.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The sample is sent to a lab for antibody testing.

What the Test Results Mean

Positive results indicate the presence of ENA antibodies, which can support a diagnosis of autoimmune diseases. However, results alone don’t confirm a diagnosis—your provider will consider symptoms, other tests, and medical history.

Common Conditions Linked to This Test

ENA antibodies are often linked to systemic lupus erythematosus (SLE), scleroderma, or other autoimmune disorders affecting connective tissues or kidneys.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

ENA antibodies are markers for specific autoimmune conditions. While not definitive on their own, they help guide further testing and treatment planning. For example, certain ENA subsets (e.g., Sm, RNP) correlate with particular disease patterns, aiding in diagnosis and monitoring.

Short name

ENA Antibody Screening/Confirmation

Frequently asked questions

What does a positive ENA antibody test mean?
A positive result suggests the presence of these antibodies, which may indicate an autoimmune condition. Your provider will review the results alongside your symptoms, other tests, and medical history to determine the next steps.
Can lifestyle changes affect ENA antibody levels?
While lifestyle factors like diet or stress may influence overall immune activity, ENA antibody levels are typically stable and not directly affected by lifestyle changes. Your provider will focus on managing symptoms and underlying conditions.
How often will I need this test?
Frequency depends on your condition and treatment plan. Your healthcare provider will advise how often to retest, especially if you’re being monitored for an autoimmune disease.
  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