Days Set Up
Monday - Friday
Analytic Time

2 - 3 days

MiChart Code
Norovirus Antigen (Sendout)
Soft Order Code

Test Updated:


Norwalk Virus, Stool
Norwalk-Like Virus (NLV)

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

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MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology

Polymerase Chain Reaction (PCR)

Test Usage

Diagnosis of gastrointestinal disease (diarrhea or vomiting) caused by norovirus genogroups 1 and 2.

Reference Range


* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect fresh random stool specimen. Add stool specimen to transport vial until liquid reaches fill line. Emulsify specimen thoroughly in transport fluid. If necessary, place a urine bag on the patient to prevent urine contamination.
Acceptable specimens are stool sent in Stool Culture transport (orange cap) (Cary Blair) or Para-Pak Culture and Sensitivity Media. Store and send at room temperature. If an outbreak of norovirus is suspected, specimens should be sent to the Michigan Department of Health & Human Services (MDHHS) for testing. Contact the MDHHS Bureau of Epidemiology at 517-335-8165 to obtain testing approval and necessary instructions prior to sending samples. Note that specimens sent to MDHHS should be stored refrigerated. Mayo specimens should be maintained at room temp.

Normal Volume
Representative portion of diarrheal stool, 1 gram or 5 mL
Minimum Volume

Billing Information

CPT Code
87798 x2
Pro Fee Code
54905-5, 54906-3

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.