Guidelines
Blood Culture Contaminants

Blood Culture Contaminants

Considerations

1. Ascertain details on blood cultures

  • How man bottles/sets were positive? Site of stick? Aerobic/anaerobic bottle? Gram Stain?
  • Multiple positive sets is concerning
  • Longer time to positivity is ofter suggestive of contaminant, although tough to utilize unless extreme

2. Patient and clinical status

  • Why were cultures obtained? Do they have signs or symptoms that correlate with infection?
  • Risk factors, such as hardware or prosthetic material? Immunocompromised host?

3. Organism

Never considered a Contaminant

Maybe considered a Contaminant

Cutibacterium

Streptococcus viridans group

Probably considered a Contaminant

Corynebacterium

Lactobacillus (Other Bacillus spp)

Micrococcus