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Conjunctival Trichrome Staining Mass Concentration (for Conjunctival Sample)

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

This test measures the concentration of a specific dye or stain used to assess the health of your conjunctiva (the clear tissue covering the white part of your eye). It may be part of an eye examination to evaluate conditions like inflammation, infection, or corneal damage.

Quick summary

["This test helps doctors diagnose or monitor eye-related conditions by examining how the conjunctiva responds to staining."]

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

Key facts at a glance

LOINC
109437-4
Short code
C trach Ag Msmt Conjunct
Synonyms
C trach Ag Msmt Conjunct
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Conjunctival trichrome staining involves applying a dye (often rose bengal or fluorescein) to the conjunctiva. The dye binds to damaged or irritated areas, allowing a healthcare provider to visually assess the extent of conjunctival abnormalities under a microscope. The mass concentration measurement quantifies how much dye is retained, which correlates with tissue integrity.

Why It’s Done

Your doctor may order this test if you have symptoms like redness, itching, discharge, or sensitivity to light, or if you’re at risk for conditions like dry eye, corneal ulcers, or severe infections. It helps distinguish between healthy and damaged conjunctival tissue.

How the Test Works

After applying the dye, a healthcare provider gently wipes or swabs the stained area. The sample is then analyzed to determine the concentration of retained dye, which reflects the presence of damaged or inflamed cells.

Preparation

No special preparation is needed. You may experience mild redness or stinging from the dye, but this usually resolves quickly. Avoid touching or rubbing your eyes before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What causes abnormal dye retention in this test?
Abnormal dye retention often occurs due to conditions like dry eye, infections (e.g., bacterial or viral conjunctivitis), chemical burns, or autoimmune disorders affecting the eye. Allergies or irritants may also trigger localized inflammation.
How long does it take to get results from this test?
Results are typically available immediately during the exam, as the test involves visual inspection and dye analysis. If further analysis is needed, results may take a few hours to a day, depending on lab protocols.
Can this test be used to diagnose all eye conditions?
No, this test is primarily used to identify conjunctival damage or inflammation. While it’s helpful for certain conditions, other tests (e.g., slit-lamp examination, culture, or imaging) may be needed for a full diagnosis. Always discuss your symptoms and test results with your healthcare provider.
  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