Conjunctival Conjunctivitis Antigen (IgG) - Immunoassay

What This Test Measures

This test detects IgG antibodies targeting conjunctival antigens. These antibodies are part of your immune system’s response to substances (like bacteria, viruses, or irritants) that may cause inflammation in the conjunctiva (the clear tissue covering the white part of the eye). The presence of these antibodies suggests an ongoing or past immune reaction.

Why It Might Be Ordered

Your healthcare provider may order this test if you have symptoms like redness, itching, discharge, or swelling in the eyes, especially if other tests (like culture or viral testing) have not clearly identified the cause. It can help differentiate between conditions caused by infections, allergies, or autoimmune responses.

How the Test Works

A small blood sample is taken, and the serum/plasma is analyzed using an immunoassay method. This test identifies IgG antibodies that bind to specific antigens from the conjunctiva, indicating an immune response.

What the Results Mean

Positive results suggest an immune-mediated response to conjunctival inflammation, which could be due to infections (e.g., bacterial, viral), chronic conditions (e.g., conjunctivitis, keratoconjunctivitis), or other inflammatory processes. Negative results mean no detectable antibodies in this test, but other causes of eye inflammation may still exist.