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Smooth Muscle Antibody Titers (Qualitative Fluid)

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

This test checks for antibodies against smooth muscle proteins, which may indicate certain autoimmune conditions affecting organs like the liver, stomach, or ovaries.

Quick summary

["Your doctor may order this test if you have unexplained symptoms or suspected autoimmune disease."]

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

Key facts at a glance

LOINC
63356-0
Short code
Smooth muscle Ab Titr Fld IF
Synonyms
Smooth muscle Ab Titr Fld IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
CPT
86430
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

Doctors use this test to help diagnose conditions like autoimmune hepatitis, chronic pancreatitis, or other connective tissue disorders. Antibodies in your blood can signal the immune system is attacking healthy cells.

No special preparation is needed, but you may be asked to fast for 8–12 hours if your blood is drawn early in the morning for better accuracy.

The test involves drawing blood from a vein in your arm. A small needle is used, and you may feel a brief pinch. Most people experience only mild discomfort afterward.

A positive result (detecting antibodies) suggests an autoimmune reaction, but it doesn’t confirm a specific diagnosis alone. Your doctor will review results alongside symptoms and other tests.

A positive SMA test may prompt further evaluation, such as liver function tests, endoscopy, or biopsy, to identify the underlying cause.

Symptoms like fatigue, abdominal pain, weight loss, or unexplained liver issues may prompt this test. Some people with SMA antibodies have no symptoms at all.

Autoimmune diseases linked to SMA antibodies can affect multiple organs, so treatment focuses on managing symptoms and controlling inflammation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

SMA antibodies are often found in autoimmune conditions like autoimmune hepatitis, where the immune system attacks liver cells. They can also appear in other disorders like chronic pancreatitis or systemic sclerosis, though not everyone with these antibodies develops symptoms.

Short name

Smooth Muscle Antibody (SMA) Test

Frequently asked questions

What does a positive SMA test mean?
A positive SMA test means your blood contains antibodies against smooth muscle proteins. This doesn’t always mean you have an active disease, but it signals a possible autoimmune reaction that may need further investigation.
Can SMA antibodies be cured?
No cure exists for SMA antibodies alone, but treating the underlying autoimmune condition—if identified—can help manage symptoms and reduce inflammation.
How often should I get this test?
Your doctor will determine how often to repeat this test based on your symptoms, lab results, and overall health. Follow-up may be needed if you develop new symptoms or if other tests confirm a related condition.
  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