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.

LOINCActiveObservation

LOINC Code 100124-7: C. pneumoniae IgA IA Qn (S)

Name: LOINC Code 100124-7: C. pneumoniae IgA IA Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:16.530Z

100124-7 is a LOINC code used to identify C. pneumoniae IgA IA 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 Chlamydophila pneumoniae Ab.IgA. 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 Chlamydophila pneumoniae Ab.IgA. 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: ACTIVE
Order vs observation: Observation
Method: IA

What it does not mean

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

Key facts

Chlamydophila pneumoniae IgA Ab [Units/volume] in Serum by Immunoassay
Chlamydophila pneumoniae Ab.IgA
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; C pneum; C pneumo; C pneumoniae; Chlamydia; Chlamydia pneumoniae; CPN; EIA; ELFA; ELISA; Enzyme immunoassay; IAA; Immune globulin A; Immunoglobulin A; MEIA; Microbiology; Pneu; pneum; Pneumo; Pneumon; Pneumonia; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR; SUDS; Twar agent

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

C. pneumoniae IgA IA Qn (S)Chlamydophila pneumoniae IgA Ab [Units/volume] in Serum by ImmunoassayC pneum IgA Ser IA-aCncChlamydophila pneumoniae Ab.IgAMICROChlamydophila pneumoniae IgA antibody, BloodACnc

Frequently asked questions

Code details

Code100124-7

SystemLOINC

Display nameC. pneumoniae IgA IA Qn (S)

DescriptionChlamydophila pneumoniae Ab.IgA

Short nameC pneum IgA Ser IA-aCnc

ComponentChlamydophila pneumoniae Ab.IgA

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassMICRO

Example units[arb'U]/mL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.72

Last changed2.72

Consumer names

Chlamydophila pneumoniae IgA antibody, Blood

Part names

Chlamydophila pneumoniae Ab.IgAACncPtSerQnIAChlamydophila pneumoniae IgAArbitrary ConcentrationPoint in time (spot)SerumImmunoassay

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.