What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 40863-3: Norovirus genogroup I Ag Ql (Stl)

Name: LOINC Code 40863-3: Norovirus genogroup I Ag Ql (Stl)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

40863-3 is a LOINC code used to identify Norovirus genogroup I Ag Ql (Stl) in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Norovirus genogroup I Ag. It is commonly used with the system or sample type Stool.

Reviewed by HealthAssure Clinical TeamUpdated 25 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Norovirus genogroup I Ag. It is commonly used with the system or sample type Stool.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Both

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Norovirus genogroup I Ag [Presence] in Stool
Norovirus genogroup I Ag
Antigen; Antigens; Bowel movement; Faecal; Faeces; Fecal; Feces; Human Calcivirus; ID; Infectious Disease; InfectiousDisease; Microbiology; Norovirus 1; Norovirus G1; Norovirus GI; Norwalk virus; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Stl; Stool = Fecal

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Norovirus genogroup I Ag Ql (Stl) (40863-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Norovirus genogroup I Ag Ql (Stl)Norovirus genogroup I Ag [Presence] in StoolNorovirus GI Ag Stl QlNorovirus genogroup I AgMICRONorovirus genogroup I antigen, StoolPrThr

Frequently asked questions

Code details

Code40863-3

SystemLOINC

Display nameNorovirus genogroup I Ag Ql (Stl)

DescriptionNorovirus genogroup I Ag

Short nameNorovirus GI Ag Stl Ql

ComponentNorovirus genogroup I Ag

PropertyPrThr

TimingPt

System (specimen)Stool

ScaleOrd

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.56

Consumer names

Norovirus genogroup I antigen, Stool

Part names

Norovirus genogroup I AgPrThrPtStoolOrdPresence or ThresholdPoint in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.