Eye Swab For C/S (Left)

Function

The Eye Swab for Culture and Sensitivity (C/S) is a microbiological procedure used to identify the specific pathogen—usually bacteria or fungi—causing an infection in the eye (conjunctivitis, keratitis, or blepharitis). The 'Sensitivity' portion of the test determines which antibiotics or antifungal agents are most effective at killing the identified organism, ensuring targeted and effective treatment.

Why it is Ordered

Ophthalmologists order this test when an eye infection is severe, chronic, or not responding to standard broad-spectrum antibiotic drops. It is particularly important for:

• Contact lens wearers (who are at risk for aggressive infections like Pseudomonas).
• Patients with suspected corneal ulcers.
• Neonates with eye discharge (to rule out specialized infections like Chlamydia).
• Pre-operative screening before major ocular surgery.

Associated Conditions

The test is primarily associated with infectious Conjunctivitis ('Pink Eye'). Common bacterial isolates include Staphylococcus aureus, Streptococcus pneumoniae, and Haemophilus influenzae. In more severe cases involving the cornea (Keratitis), the test may find more dangerous pathogens like Acanthamoeba or various fungal species. A 'Culture and Sensitivity' is the gold standard for preventing vision loss; by identifying the exact 'enemy,' doctors can avoid the 'trial and error' approach of using different eye drops, which can lead to antibiotic resistance and prolonged inflammation of the ocular surface.