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 40939-1: Yersinia sp IgM IA Qn (S)

Name: LOINC Code 40939-1: Yersinia sp IgM IA Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:27.679Z

40939-1 is a LOINC code used to identify Yersinia sp IgM 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 Yersinia sp Ab.IgM. 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 Yersinia sp Ab.IgM. 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: Both
Method: IA

What it does not mean

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

Key facts

Yersinia sp IgM Ab [Units/volume] in Serum by Immunoassay
Yersinia sp Ab.IgM
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; EIA; ELFA; ELISA; Enzyme immunoassay; IAA; ID; Immune globulin M; Immunoglobulin M; Infectious Disease; InfectiousDisease; MEIA; Microbiology; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; species; spp; SR; SUDS

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

Yersinia sp IgM IA Qn (S)Yersinia sp IgM Ab [Units/volume] in Serum by ImmunoassayYersinia IgM Ser IA-aCncYersinia sp Ab.IgMMICROYersinia sp IgM antibody, BloodACnc

Frequently asked questions

Code details

Code40939-1

SystemLOINC

Display nameYersinia sp IgM IA Qn (S)

DescriptionYersinia sp Ab.IgM

Short nameYersinia IgM Ser IA-aCnc

ComponentYersinia sp Ab.IgM

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.69

Consumer names

Yersinia sp IgM antibody, Blood

Part names

Yersinia sp Ab.IgMACncPtSerQnIAYersinia sp IgMArbitrary 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.