G164

Gram – Intraocular Fluid: no cells, gram positive bacilli (Bacillus species) – Shipped February 20, 2017

HISTORY

A simulated intraocular fluid smear collected from a 34 year old stone worker with eye injury and pain was sent to category A, B, C, and C1 laboratories. Participants were expected to report gram positive bacilli and no cells.

MAIN EDUCATIONAL POINTS from G164

  1. Gram stains of vitreous samples are positive for organisms in less than half of bacterial endophthalmitis cases.
  2. Negative stains have little predictive value, but a positive stain is highly predictive of a positive culture.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques, Gram