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 18332-7: TPO IgG Qn

Name: LOINC Code 18332-7: TPO IgG Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:27.587Z

18332-7 is a LOINC code used to identify TPO IgG Qn 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 Thyroperoxidase Ab.IgG. It is commonly used with the system or sample type Ser/Plas.

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 Thyroperoxidase Ab.IgG. It is commonly used with the system or sample type Ser/Plas.

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

What it does not mean

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

Key facts

Thyroperoxidase IgG Ab [Units/volume] in Serum or Plasma
Thyroperoxidase Ab.IgG
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Endocrine; Endocrinology; Immune globulin G; Immunoglobulin G; Iodide peroxidase; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Thyroid Microsomal; Thyroid microsomes; Thyroid peroxidase; TPO

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

TPO IgG QnThyroperoxidase IgG Ab [Units/volume] in Serum or PlasmaThyroperoxidase IgG SerPl-aCncThyroperoxidase Ab.IgGSEROTPO IgG antibody, BloodACnc

Frequently asked questions

Code details

Code18332-7

SystemLOINC

Display nameTPO IgG Qn

DescriptionThyroperoxidase Ab.IgG

Short nameThyroperoxidase IgG SerPl-aCnc

ComponentThyroperoxidase Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassSERO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.73

Consumer names

TPO IgG antibody, Blood

Part names

Thyroperoxidase Ab.IgGACncPtSer/PlasQnThyroperoxidase IgGArbitrary ConcentrationPoint in time (spot)Serum or Plasma

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.