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Lung-specific protein antigen (serum) – quantitative immunoassay

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

This test measures a protein associated with lung tissue, which may help assess lung health or detect certain lung conditions.

Quick summary

["This test may support evaluation of lung function or inflammation in the airways."]

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

Key facts at a glance

LOINC
31868-3
Short code
L pneumo1 Ag Ur Ql
Synonyms
L pneumo1 Ag Ur Ql
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like persistent cough, shortness of breath, or lung-related concerns. It could also be used in research or specialized diagnostic scenarios involving lung biomarkers.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. Avoid alcohol for 24 hours before testing if instructed by your provider.

What the Results Mean

Results are interpreted by your healthcare provider based on your medical history and symptoms. Elevated levels may indicate lung inflammation or other pulmonary conditions, but results alone don’t diagnose a specific issue.

Common Conditions Monitored

This test may be used to monitor lung-specific biomarkers in conditions like idiopathic pulmonary fibrosis, chronic obstructive pulmonary disease (COPD), or other respiratory disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Elevated levels of this lung-specific protein in serum may signal inflammation, fibrosis, or other lung pathologies. However, interpretation requires clinical correlation with patient symptoms and history.

Short name

Lung Protein Test

Frequently asked questions

Will this test show if I have lung cancer?
This test measures a protein linked to lung tissue but isn’t a cancer-specific marker. It may help assess inflammation or lung health rather than diagnosing cancer directly. Other tests would be needed for cancer evaluation.
How long will I need to wait for results?
Results typically arrive within 1–3 business days, depending on lab processing. Your doctor will contact you once available.
Can I drink coffee before this test?
Standard blood tests like this one don’t require caffeine restrictions, but follow your doctor’s specific instructions if they’ve provided any.
  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