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.

LOINC

LOINC Code 29318-3: S. pneumoniae group B Ag LA Ql (S)

Name: LOINC Code 29318-3: S. pneumoniae group B Ag LA Ql (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:15.473Z

29318-3 is a LOINC code used to identify S. pneumoniae group B Ag LA Ql (S) 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 pneumoniae group B Ag. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 pneumoniae group B Ag. It is commonly used with the system or sample type Ser.

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: DEPRECATED
Method: LA

What it does not mean

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

Key facts

Deprecated Streptococcus pneumoniae group B Ag in serum by latex agglutionation
Streptococcus pneumoniae group B Ag
Antigen; Antigens; Arbitrary concentration; ID; Infectious Disease; InfectiousDisease; LAT; Latex agglutination; Microbiology; Ordinal; Pneu; pneum; Pneumo; Pneumococ; Pneumococcal; Pneumococcal pneumonia; Pneumococcus; Pneumon; Pneumonia; Point in time; QL; Qual; Qualitative; Random; S pneumo; S pneumoniae; Screen; Serum; Spn; SR; Strep; Strept

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.

Common synonyms

S. pneumoniae group B Ag LA Ql (S)Deprecated Streptococcus pneumoniae group B Ag in serum by latex agglutionationDeprecated S pneumB Ag Ser Ql LAStreptococcus pneumoniae group B AgMICROStreptococcus pneumoniae group B antigen, BloodACnc

Frequently asked questions

Code details

Code29318-3

SystemLOINC

Display nameS. pneumoniae group B Ag LA Ql (S)

DescriptionStreptococcus pneumoniae group B Ag

Short nameDeprecated S pneumB Ag Ser Ql LA

ComponentStreptococcus pneumoniae group B Ag

PropertyACnc

TimingPt

System (specimen)Ser

ScaleOrd

MethodLA

ClassMICRO

StatusDEPRECATED

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.03

Last changed2.40

Consumer names

Streptococcus pneumoniae group B antigen, Blood

Part names

Streptococcus pneumoniae group B AgACncPtSerOrdLAAgArbitrary ConcentrationPoint in time (spot)SerumLatex agglutination

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.