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Conjunctival culture and sensitivity

Eye Care estimated about CNY 200-450

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Description

A diagnostic test that isolates and identifies bacteria from the conjunctival sac and determines their susceptibility to antimicrobial agents.

Main Uses

To identify causative bacterial pathogens in suspected infectious conjunctivitis, keratoconjunctivitis, or postoperative ocular infections; guide targeted antimicrobial therapy through antibiotic susceptibility testing; differentiate bacterial from viral, allergic, or non-infectious conjunctivitis; monitor treatment response in refractory or recurrent cases; and support infection control in outbreak settings (e.g., neonatal conjunctivitis screening).

Normal Range

No growth of pathogenic bacteria after 24–48 hours of aerobic and anaerobic incubation; normal flora (e.g., coagulase-negative Staphylococci, Corynebacterium spp., Propionibacterium acnes) may be present in low quantities without clinical significance. Quantitative interpretation is not standardized; clinical correlation with symptoms and microscopy is essential.

Low Values - Possible Causes

Adequate prior antibiotic therapy (topical or systemic), improper specimen collection (e.g., contaminated swab, insufficient inoculum, delayed transport), fastidious or non-culturable organisms (e.g., Chlamydia trachomatis, Mycoplasma, viruses), prior antiseptic use (e.g., povidone-iodine), or resolution of acute infection before sampling.

High Values - Possible Causes

Bacterial conjunctivitis (e.g., Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae, Pseudomonas aeruginosa), keratitis with secondary conjunctival involvement, chronic blepharitis with bacterial overgrowth, post-surgical or post-traumatic ocular infection, or immunocompromised states facilitating opportunistic pathogens (e.g., Serratia marcescens, Enterobacter spp.).

conjunctival culture bacterial sensitivity test ocular infection diagnostics

estimated about CNY 200-450