Clinical Microbiology

      Blood cultures
  • Why isn't Gram stain done on blood cultures as soon as they are received in the microbiology lab?

    For organisms to be detected on Gram stain, there must be > 10E5 bacteria per mL of fluid and that would not be compatible with life. Therefore, Gram stain of the blood culture is performed only after the incubator indicator becomes positive for possible growth of organism.