Test: | Escherichia coli(Hemorrhagic) Culture, Stool Order in NUlirt or complete NPHL Test Order Form |
Synonym: | Culture, Hemorrhagic E.coli; Culture, E.coli 0157: H7; Culture, Shigatoxin Positive E. coli |
Method: | Standard reference procedure for confirmation of identification of an isolate for Hemorrhagic E.coli 0157:H7 by culture or isolation of E.coli O157:H7 in Positive Shiga toxin EIA stool. |
Availability: | Daily |
Specimen: | Shigatoxin positive stool in enteric transport media preferred or pure culture of E.coli sorbitol-negative isolate on MacConkey or MacConkey Sorbitol plate for identification. Positive Shiga EIA stool in enteric transport media, fill to line. |
Collection Device: | Sterile container or stool maintenance media Specimen Labeling: Test subject to CLIA regulations and requires 2 patient identifiers and specimen source on container. |
Volume: | 10 mL stool in enteric transport media. |
Storage/Transport: | Prior to and during shipment: Unpreserved stool at ambient 15-25°C; if transport delayed > 2h, preserve in enteric transport media (Cary-Blair media) at ambient 15-25°C up to 4d.
|
Unacceptable: | Non-sterile or leaking container, multiple specimens ( more than 1 in a 24 hour period), dry specimen, delayed transport to lab without use of appropriate preservative or red transport media indicator has turned yellow. Diapers are not acceptable. Isolates submitted on blood agar plates may lose toxin expression and are therefore not preferred transport. |
Specimen Stability: | Unpreserved stool stable at Ambient 15-25°C < 2h, preserve in maintenance media at ambient 15-25°C up to 4 days |
Reference Interval: | Reported as soon as positive detected or Final: Negative at 2 days. |
Reportable Disease: | Report toxicogenic E.coli within 7d to local or state health department. Refer to Nebraska DHHS Title 173, Communicable Diseases. |
Comments: | Pre-approval needed from state or local health department. Send approval to NPHL@unmc.edu or call (402) 559-9444. Note: To test for Shiga toxin from E.coli in stool, see order for Stool Culture or Shiga Toxin EIA. NUlirt packing list or NPHL Test Order Form (completed in entirety) must accompany the specimen. |
Revised: | 6/9/2021 |