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.

LOINCObservation

LOINC Code 27390-4: S. pneumoniae 19 IgG (S) [Mass/Vol]

Name: LOINC Code 27390-4: S. pneumoniae 19 IgG (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

27390-4 is a LOINC code used to identify S. pneumoniae 19 IgG (S) [Mass/Vol] 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 19 Ab.IgG. It is commonly used with the system or sample type Ser.

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 pneumoniae 19 Ab.IgG. 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
Order vs observation: Observation

What it does not mean

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

Key facts

Deprecated Streptococcus pneumoniae 19 IgG Ab [Mass/volume] in Serum
Streptococcus pneumoniae 19 Ab.IgG
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Level; Mass concentration; Microbiology; Pneu; pneum; Pneumo; Pneumococ; Pneumococcal; Pneumococcal pneumonia; Pneumococcus; Pneumon; Pneumonia; Point in time; QNT; Quan; Quant; Quantitative; Random; S pneum19; S pneumo; S pneumoniae; Serum; Spn; SR; Strep; Strept; Streptococcus pneumoniae 19f

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. pneumoniae 19 IgG (S) [Mass/Vol] (27390-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

S. pneumoniae 19 IgG (S) [Mass/Vol]Deprecated Streptococcus pneumoniae 19 IgG Ab [Mass/volume] in SerumDeprecated S pneum19 IgG Ser-mCncStreptococcus pneumoniae 19 Ab.IgGMICROStreptococcus pneumoniae 19 IgG antibody, BloodMCnc

Frequently asked questions

Code details

Code27390-4

SystemLOINC

Display nameS. pneumoniae 19 IgG (S) [Mass/Vol]

DescriptionStreptococcus pneumoniae 19 Ab.IgG

Short nameDeprecated S pneum19 IgG Ser-mCnc

ComponentStreptococcus pneumoniae 19 Ab.IgG

PropertyMCnc

TimingPt

System (specimen)Ser

ScaleQn

ClassMICRO

Example unitsug/mL

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.00

Last changed2.70

Consumer names

Streptococcus pneumoniae 19 IgG antibody, Blood

Part names

Streptococcus pneumoniae 19 Ab.IgGMCncPtSerQnStreptococcus pneumoniae 19 IgGMass ConcentrationPoint in time (spot)Serum

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.