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 5383-5: TPO Ab LA [Titer]

Name: LOINC Code 5383-5: TPO Ab LA [Titer]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

5383-5 is a LOINC code used to identify TPO Ab LA [Titer] 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. It is commonly used with the system or sample type Ser/Plas.

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 Thyroperoxidase Ab. 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
Method: LA

What it does not mean

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

Key facts

Thyroperoxidase Ab [Titer] in Serum or Plasma by Latex agglutination
Thyroperoxidase Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Dilution factor; Dilution Factor (Titer); Endocrine; Endocrinology; Iodide peroxidase; LAT; Latex agglutination; Pl; Plasma; Plsm; Point in time; Random; Serology; SerP; SerPl; SerPlas; Serum; Serum or plasma; SmQn; SR; Thyroid Microsomal; Thyroid microsomes; Thyroid peroxidase; Titer; Titered; Titre; TPO; Ttr

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 TPO Ab LA [Titer] (5383-5)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

TPO Ab LA [Titer]Thyroperoxidase Ab [Titer] in Serum or Plasma by Latex agglutinationThyroperoxidase Ab Titr SerPl LAThyroperoxidase AbSEROTPO antibody, BloodTitr

Frequently asked questions

Code details

Code5383-5

SystemLOINC

Display nameTPO Ab LA [Titer]

DescriptionThyroperoxidase Ab

Short nameThyroperoxidase Ab Titr SerPl LA

ComponentThyroperoxidase Ab

PropertyTitr

TimingPt

System (specimen)Ser/Plas

ScaleSemiQn

MethodLA

ClassSERO

Example unitstiter

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.75

Consumer names

TPO antibody, Blood

Part names

Thyroperoxidase AbTitrPtSer/PlasSemiQnLATiterPoint in time (spot)Serum or PlasmaLatex agglutination

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.