pleural peritoneal pericardial and synovial fluids culture l.
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Pleural, peritoneal, pericardial and synovial fluids culture. D. M. M. Lab. Body Fluid Culture. Aim of the test Isolate and identify pathogenic organisms from normally sterile body fluids and perform sensitivity test Types of specimen

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body fluid culture
Body Fluid Culture
  • Aim of the test
  • Isolate and identify pathogenic organisms from normally sterile body fluids and perform sensitivity test
  • Types of specimen
  • Aseptically aspirated body fluid (e.g., , synovial, peritoneal fluid).
  • Criteria of specimen rejection
  • Inappropriate specimen transport device; mislabeled specimen; unlabeled specimen; specimen received after prolonged delay (usually more than two hour); specimen received in expired transport media.
pre specimen processing
Pre specimen processing
  • Who will collect the specimen
  • Physician
  • Quantity of specimen
  • 1-5 mL is adequate, a larger quantity of fluid is better.
  • Time relapse before processing the sample
  • Body fluids should be treated as CSF specimens and should processed immediately.
  • Storage
  • Maintain specimen at room temperature. Do not refrigerate.
specimen processing6
Specimen processing
  • Body fluids for culture should be concentrated by either filtration or high speed centrifugation.
  • Filtration of fluid through a 0.45-mm poresize membrane filter allows a greater volume of fluid to be processed and usually yield better results, then the filter should be cut aseptically into pieces, one of which is placed on chocolate agar for incubation in 5% carbon dioxide, one on MacConkey agar, on blood agar plate for aerobic incubation, and the last on a blood agar plate for anaerobic incubation.
specimen processing7
Specimen processing
  • If fluid has been concentrated by centrifugation, the resulting sediment should be incubated to inoculated to an enrichment broth, blood, chocolate and MacConkey agars.
  • All fluids should be processed for direct microscopic examination, in general if one organism is seen per oil immersion field at least 105 organisms per milliliter of specimen are present.
  • Specimens for fungi should be examined by direct wet preparation or by preparing 10% KOH for visualization of fungi element from a wet preparation.
  • Acid Fast stain for Mycobacterium spp.
post specimen processing
Post specimen processing
  • Interfering factors:
  • Patient on antibiotic therapy.
  • Improper sample collection.
  • Result reporting:
  • Report Gram stain, KOH, and AFS finding as an initial report.
  • Report the isolated pathogen and its sensitivity pattern as a final report.
  • Turn around time:
  • Gram stain and wet mount results should be available 1 hour after specimen receipt.
  • Isolation of a possible pathogen can be expected after 2-4 days.
  • Negative culture will be reported out 1-2 days after the receipt of the specimen.