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 22558-1: S. pneumoniae 9 IgG Qn (S)

Name: LOINC Code 22558-1: S. pneumoniae 9 IgG Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

22558-1 is a LOINC code used to identify S. pneumoniae 9 IgG Qn (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 9 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 9 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 9 IgG Ab [Units/volume] in Serum
Streptococcus pneumoniae 9 Ab.IgG
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Pneu; pneum; Pneumo; Pneumococ; Pneumococcal; Pneumococcal pneumonia; Pneumococcus; Pneumon; Pneumonia; Point in time; QNT; Quan; Quant; Quantitative; Random; S pneum9; S pneumo; S pneumoniae; Serum; Spn; SR; Strep; Strept; Streptococcus pneumoniae 9n

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 9 IgG Qn (S) (22558-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

S. pneumoniae 9 IgG Qn (S)Deprecated Streptococcus pneumoniae 9 IgG Ab [Units/volume] in SerumDeprecated S pneum9 IgG Ser-aCncStreptococcus pneumoniae 9 Ab.IgGMICROStreptococcus pneumoniae 9 IgG antibody, BloodACnc

Frequently asked questions

Code details

Code22558-1

SystemLOINC

Display nameS. pneumoniae 9 IgG Qn (S)

DescriptionStreptococcus pneumoniae 9 Ab.IgG

Short nameDeprecated S pneum9 IgG Ser-aCnc

ComponentStreptococcus pneumoniae 9 Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

ClassMICRO

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0n

Last changed2.69

Consumer names

Streptococcus pneumoniae 9 IgG antibody, Blood

Part names

Streptococcus pneumoniae 9 Ab.IgGACncPtSerQnStreptococcus pneumoniae 9 IgGArbitrary 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.