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Test Code CDIFTOX Clostridium difficile Toxin B PCR, Amplified Probe 

Additional Codes

Compendium Code (Iatric): L700.5005

Specimen Requirements

Specimen must arrive within 5 days of collection.


1 g of liquid feces in a screw-capped container. Formed specimen is not acceptable. Formed stool is not typical of disease.  Positive results with formed stools may be detecting DNA of the C difficile toxin that is not causing disease (asymptomatic carrier).  These results may be misleading.  This testing method has only been validated by the manufacturer for non-formed stool samples.  There is no data available to back up results of a formed stool sample.  The definition of a formed stool is stool that does not take the shape of the container it is in and a swab does not easily break the surface of the sample.

Send specimen refrigerated. Do not freeze.


Note:  Specimen source is required on request form for processing.



Polymerase Chain Reaction (PCR) Using GeneXpert® (Cepheid)

Reference Values


Children <2 years may carry toxigenic Clostridium difficile as part of their normal GI flora without having disease.

Performing Laboratory

St. Lukes Hospital Laboratory

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

CPT: 87493

LOINC: 54067-4