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Anti-Glomerular Basement Membrane Antibody (Anti-GBM) Screening Test (Qualitative)

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

This test detects antibodies that may indicate a rare autoimmune condition affecting the kidneys, called Goodpasture syndrome.

Quick summary

["This screening helps identify potential kidney disease linked to immune system attacks on kidney tissues."]

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

Key facts at a glance

LOINC
7084-7
Short code
Fire Ant IgG Qn
Synonyms
Fire Ant IgG Qn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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

What This Test Measures

The test looks for the presence of antibodies targeting a protein found in the kidney’s filtering units (glomeruli). These antibodies can cause inflammation and damage over time.

Why It’s Done

Doctors may order this test if you have symptoms like blood in urine, unexplained kidney problems, or if they suspect autoimmune kidney diseases like Goodpasture syndrome.

Common Symptoms to Watch For

Symptoms like hematuria (blood in urine), proteinuria (excess protein in urine), or severe joint/muscle pain may prompt this screening.

What to Expect During Testing

A blood sample is drawn, and the lab uses an immunoassay method to check for specific antibodies. Results are qualitative (positive/negative) rather than a numeric value.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Anti-GBM Antibody Screen

Frequently asked questions

Positive results suggest a high likelihood of Goodpasture syndrome or other autoimmune kidney diseases. Follow-up testing (like a confirmatory anti-GBM antibody assay) may be needed for diagnosis.
A positive screening test does not confirm the diagnosis alone. Your doctor will review symptoms, medical history, and possibly other tests to make a full assessment.
What does a positive result mean?
A positive result means your blood contains antibodies that may target kidney tissues. This could indicate an autoimmune condition requiring further evaluation by a specialist.
Can lifestyle changes help if this test is positive?
While this test identifies a potential risk, treatment often focuses on managing symptoms and slowing kidney damage. Your doctor may recommend medications, dietary adjustments, or close monitoring.
  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