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Macrophage Count in Bronchial Lavage Fluid

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

This test measures the number of macrophages found in fluid collected from your airways during a bronchoscopy. Macrophages are immune cells that help protect your lungs from infections and inflammation.

Quick summary

["Macrophages in your airway fluid can help identify lung inflammation or infection."]

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

Key facts at a glance

LOINC
71594-6
Short code
Macrophages NFr.DF Bronch Manual
Synonyms
Macrophages NFr.DF Bronch Manual
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
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 Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like persistent cough, shortness of breath, or unexplained lung issues. It could also be used to monitor conditions like chronic obstructive pulmonary disease (COPD), asthma, or infections such as pneumonia.

What to Expect Before the Test

You’ll likely undergo a bronchoscopy, where a thin tube with a camera is inserted into your airways. Fluid is collected from your lungs, and macrophages in the sample are counted. This procedure may cause discomfort but is generally well-tolerated with local anesthesia.

What the Results Mean

Higher-than-normal macrophage counts may indicate inflammation, infection, or lung damage. Lower counts could suggest reduced immune activity in your airways. Results are interpreted by your provider based on your overall health and symptoms.

Common Causes of Abnormal Results

Elevated macrophage counts can result from conditions like bronchitis, lung infections, or certain lung diseases. Low counts might be seen in rare cases of immune suppression or after certain treatments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Macrophage Count (Bronchial Lavage)

Frequently asked questions

How is this test used in diagnosis or treatment?
This test helps doctors assess lung health, especially in diagnosing or monitoring conditions affecting your airways. It may be part of a broader evaluation for respiratory issues, guiding treatment decisions like medication adjustments or further testing.
What preparation is needed before the test?
No strict dietary or medication restrictions apply, but inform your provider about any recent infections or medications you’re taking. Follow any specific instructions your clinic provides for the bronchoscopy procedure.
How long will results take to return?
Results are typically available within a few days to a week, depending on lab processing and your provider’s workflow. Your healthcare team will discuss findings with you during a follow-up 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