Clostridium difficile Culture with Reflex to Cytotoxin Cell Assay
Also known as: MC CDIF
Use
This test serves as a reference method for the diagnosis of Clostridioides (Clostridium) difficile-associated diarrhea. It provides culture identification of Clostridium difficile, followed by a cytotoxin cell assay if the culture result is positive. Although not the initial recommended test, it serves as a confirmatory method with a turnaround time of four days for negative results and sooner for positive identification. Culture methods can help identify the presence of the organism, which may not always produce toxin, thereby assisting in diagnosing antibiotic-associated colitis and healthcare-associated diarrhea.
Special Instructions
Not provided.
Limitations
Culture methods have limitations, including longer turnaround times compared to PCR methods, and the possibility of detecting organisms that may not produce toxins (therefore not causing disease). This test should not be used as a standalone diagnostic tool but in conjunction with clinical findings and other diagnostic tests such as toxin gene PCR assays. Formed stools and improperly collected or stored specimens (e.g., placed in formalin) are unacceptable and may lead to rejection.
Methodology
Culture-based
Biomarkers
Clostridioides difficile
Microorganism
LOINC Codes
- 562-9 - C diff Stl Ql Cult
Result Turnaround Time
1-4 days
Related Documents
For more information, please review the documents below
Specimen
Stool
Volume
5 mL
Minimum Volume
1 mL
Container
unpreserved stool transport vial (ARUP supply #40910) or Cary-Blair transport media (ARUP supply #29799)
Collection Instructions
Transfer 5 mL stool to an unpreserved stool transport vial or place in Cary-Blair transport media.
Storage Instructions
Stool should be stored frozen before and during transportation.
Causes for Rejection
Formed stools, multiple specimens (more than one in 24 hours), or specimens in PVA or formalin.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 2 hours |
| Refrigerated | 48 hours |
| Frozen | 1 week |
Other tests from different labs that may be relevant
