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 23340-3: Paratuberculosis reaction wheal 3 days post 0.1 mL johnin intradermal (Skin) [Diam]

Name: LOINC Code 23340-3: Paratuberculosis reaction wheal 3 days post 0.1 mL johnin intradermal (Skin) [Diam]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:30.731Z

23340-3 is a LOINC code used to identify Paratuberculosis reaction wheal 3 days post 0.1 mL johnin intradermal (Skin) [Diam] 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 Paratuberculosis reaction wheal^3D post 0.1 mL johnin ID. It is commonly used with the system or sample type Skin.

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 Paratuberculosis reaction wheal^3D post 0.1 mL johnin ID. It is commonly used with the system or sample type Skin.

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

What it does not mean

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

Key facts

Paratuberculosis reaction wheal [Diameter] --3 days post 0.1 mL johnin intradermal
Paratuberculosis reaction wheal^3D post 0.1 mL johnin ID
Japan - Breeding sheep
3D p .1mL Johnin; After; Dermatologic; Diameter; Epidermis; Identifier; Integument; Intradermal; MAP; MAP Wheal; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; React; Rx wheal; Rxn; Skin test; SKIN TESTS; Skn

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

Paratuberculosis reaction wheal 3 days post 0.1 mL johnin intradermal (Skin) [Diam]Paratuberculosis reaction wheal [Diameter] --3 days post 0.1 mL johnin intradermalMAP Wheal 3D p .1mL Johnin DiamParatuberculosis reaction wheal^3D post 0.1 mL johnin IDCHALSKINParatuberculosis reaction wheal 3 days after 0.1 mL Johnin Intradermal, SkinDiam

Frequently asked questions

Code details

Code23340-3

SystemLOINC

Display nameParatuberculosis reaction wheal 3 days post 0.1 mL johnin intradermal (Skin) [Diam]

DescriptionParatuberculosis reaction wheal^3D post 0.1 mL johnin ID

Short nameMAP Wheal 3D p .1mL Johnin Diam

ComponentParatuberculosis reaction wheal^3D post 0.1 mL johnin ID

PropertyDiam

TimingPt

System (specimen)Skin

ScaleQn

ClassCHALSKIN

Example unitsmm

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0n

Last changed2.42

Consumer names

Paratuberculosis reaction wheal 3 days after 0.1 mL Johnin Intradermal, Skin

Part names

Paratuberculosis reaction wheal^3D post 0.1 mL johnin IDDiamPtSkinQnDiameterPoint in time (spot)

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.