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Conjunctival Conjunctival Protein (or Conjunctival Fluid Protein) Analysis via Probe

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

This test measures protein levels in fluid from your conjunctiva—the clear tissue surrounding your eye—using a specialized probe. It may help assess inflammation, infection, or other eye-related conditions.

Quick summary

["Protein levels in eye fluid can signal eye health or disease."]

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

Key facts at a glance

LOINC
99778-3
Short code
C trach rRNA Conjunct Ql NAA+probe
Synonyms
C trach rRNA Conjunct Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 detects the presence and concentration of proteins in conjunctival fluid, which can include markers of inflammation, infection, or other ocular conditions. Proteins like albumin or immunoglobulins may be analyzed depending on the probe’s design.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like redness, discharge, or discomfort in your eyes, or if you’re being evaluated for conditions like conjunctivitis, dry eye syndrome, or autoimmune eye diseases.

Sample Collection

A sterile probe is gently inserted into the conjunctival sac (the space between your eye and eyelid) to collect a small sample of fluid. This is usually a quick, painless procedure with minimal discomfort.

What to Expect Before the Test

No special preparation is needed. You may be asked to avoid eye drops or ointments for a short time before the test to ensure accurate results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may suggest this test if you have persistent eye redness, discharge, or discomfort that doesn’t improve with standard treatments, or if you’re at risk for conditions like dry eye or autoimmune eye diseases.
What does a high or low protein level mean?
A high protein level often suggests inflammation or infection, while very low levels might indicate dryness or other ocular surface issues. Your results will be interpreted by a healthcare provider based on your symptoms and medical history.
Is this test painful?
Most patients report minimal discomfort, as the procedure involves a quick insertion of a sterile probe. If you experience pain, let your healthcare provider know, as they may adjust the technique.
  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