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EXTERNAL EYE/CONJUNCTIVA CULTURE
Test CodeLAB943
CPT Codes
87070
Setup Schedule
Set Up:Daily Report Available:3 days
Clinical Significance
Most cases of conjunctivitis are caused by Streptococcus pneumoniae, Hemophilis influenzae, and Staphylococcus aureus. The predominant causes of bacterial keratitis, which are rare in healthy eyes, are Staph. aureus, S. pneumoniae, and Pseudomonas aeruginosa. Common predisposing factors include dirty contact lenses, foreign bodies, or misdirected eyelashes, and previous Herpes zoster or Herpes simplex eye infections. Local therapy is usually the rule for keratitis. Bacterial endophthalmitis usually occurs as a complication of ocular surgery or following eye trauma. Staph. aureus accounts for about 50% of the cases and assorted gram-negative organisms, including Pseudomonas, account for 25%. Organisms considered normal skin flora, especially coag-neg Staph and Bacillus cereus, plus anaerobes can also cause internal eye infections. Because of the constant washing activity of tears, which contain antibacterial factors, the number of organisms recovered from cultures of many eye infections may be relatively low.
Performing Laboratory
GBMC Microbiology
