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 18481-2: S. pyogenes Ag Ql (Throat)

Name: LOINC Code 18481-2: S. pyogenes Ag Ql (Throat)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

18481-2 is a LOINC code used to identify S. pyogenes Ag Ql (Throat) 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 Streptococcus pyogenes Ag. It is commonly used with the system or sample type Thrt.

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 Streptococcus pyogenes Ag. It is commonly used with the system or sample type Thrt.

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

Streptococcus pyogenes Ag [Presence] in Throat
Streptococcus pyogenes Ag
Antigen; Antigens; GAS; Group A Strep; ID; Infectious Disease; InfectiousDisease; Microbiology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; S pyogenes; Screen; Steptococcus Group A; Strep; Strept; Streptococci group A; Streptococcus group A; Throat; UniversalLabOrders; Upper respiratory

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 S. pyogenes Ag Ql (Throat) (18481-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

S. pyogenes Ag Ql (Throat)Streptococcus pyogenes Ag [Presence] in ThroatS pyo Ag Throat QlStreptococcus pyogenes AgMICROStreptococcus pyogenes antigen, ThroatPrThr

Frequently asked questions

Code details

Code18481-2

SystemLOINC

Display nameS. pyogenes Ag Ql (Throat)

DescriptionStreptococcus pyogenes Ag

Short nameS pyo Ag Throat Ql

ComponentStreptococcus pyogenes Ag

PropertyPrThr

TimingPt

System (specimen)Thrt

ScaleOrd

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.73

Consumer names

Streptococcus pyogenes antigen, Throat

Part names

Streptococcus pyogenes AgPrThrPtThrtOrdPresence or ThresholdPoint in time (spot)Throat

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.