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 24129-9: B. pertussis.pertussis toxin IgM IA Qn (S)

Name: LOINC Code 24129-9: B. pertussis.pertussis toxin IgM IA Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:12.418Z

24129-9 is a LOINC code used to identify B. pertussis.pertussis toxin 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 Bordetella pertussis.pertussis toxin 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 Bordetella pertussis.pertussis toxin 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

Bordetella pertussis.pertussis toxin IgM Ab [Units/volume] in Serum by Immunoassay
Bordetella pertussis.pertussis toxin Ab.IgM
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; B pert; B pert.PT; B pert.PT Ab; B pert.PT IgM; B pertussis; EIA; ELFA; ELISA; Enzyme immunoassay; IAA; ID; Immune globulin M; Immunoglobulin M; Infectious Disease; InfectiousDisease; MEIA; Microbiology; Pertussis; Point in time; PT; QNT; Quan; Quant; Quantitative; Random; Serum; SR; SUDS; Whooping cough

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

B. pertussis.pertussis toxin IgM IA Qn (S)Bordetella pertussis.pertussis toxin IgM Ab [Units/volume] in Serum by ImmunoassayB pert.PT IgM Ser IA-aCncBordetella pertussis.pertussis toxin Ab.IgMMICROBordetella pertussis.pertussis toxin IgM antibody, BloodACnc

Frequently asked questions

Code details

Code24129-9

SystemLOINC

Display nameB. pertussis.pertussis toxin IgM IA Qn (S)

DescriptionBordetella pertussis.pertussis toxin Ab.IgM

Short nameB pert.PT IgM Ser IA-aCnc

ComponentBordetella pertussis.pertussis toxin Ab.IgM

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassMICRO

Example unitsarb U/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0o

Last changed2.73

Consumer names

Bordetella pertussis.pertussis toxin IgM antibody, Blood

Part names

Bordetella pertussis.pertussis toxin Ab.IgMACncPtSerQnIABordetella pertussis.pertussis toxin 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.