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Lung Protein/Enzyme Screening for Pneumonia (Rapid Immunoassay)

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

This test helps quickly detect certain proteins or enzymes in your blood that may indicate lung infection or inflammation, such as pneumonia.

Quick summary

["A rapid screening test to check for possible lung infection or damage."]

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

Key facts at a glance

LOINC
77684-9
Short code
L pneumo1 Ag Ur Ql IA.rapid
Synonyms
L pneumo1 Ag Ur Ql IA.rapid
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia-rapid
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

What This Test Measures

This test uses a rapid immunoassay method to measure specific biomarkers in your blood. These biomarkers may include substances like **neutrophil gelatinase-associated lipocalin (NGAL)** or **procalcitonin**, which can signal inflammation or infection in the lungs. The results help identify if pneumonia or other lung conditions are present.

How the Test Works

A small blood sample is taken from your arm. The sample is processed quickly to detect the presence of these biomarkers using a rapid immunoassay technique, often involving a color change or signal detection to indicate positive or negative results.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fever, cough, shortness of breath, or chest pain that suggest pneumonia or another lung issue. It can also be used as a screening tool in certain clinical settings, such as emergency departments or outpatient care.

What to Expect Before the Test

No special preparation is needed for this test. You may have a slight bruise or soreness at the injection site, but this usually goes away quickly. If you’re on blood-thinning medication, let your provider know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lung Protein/Enzyme Screen (Rapid)

Frequently asked questions

What does a positive result mean?
A positive result suggests the presence of biomarkers that may indicate lung inflammation or infection, such as pneumonia. However, this test is a screening tool and may not provide a definitive diagnosis. Further testing, like a chest X-ray or culture, may be needed to confirm the cause of your symptoms.
Can this test replace a full blood workup?
No, this test is a rapid screening tool and does not replace a full blood test or other diagnostic tests. It helps identify potential concerns quickly but should be interpreted alongside clinical findings and other tests by your healthcare provider.
How soon will I get my results?
Results are typically available within minutes to a few hours, depending on the lab’s processing time. Your healthcare provider will discuss the results with you during your visit.
  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