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 51423-2: Corticotropin pre or post Unsp challenge (P) [Moles/Vol]

Name: LOINC Code 51423-2: Corticotropin pre or post Unsp challenge (P) [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:35.012Z

51423-2 is a LOINC code used to identify Corticotropin pre or post Unsp challenge (P) [Moles/Vol] 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 Corticotropin^pre or post XXX challenge. It is commonly used with the system or sample type 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 Corticotropin^pre or post XXX challenge. It is commonly used with the system or sample type 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: Observation

What it does not mean

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

Key facts

Corticotropin [Moles/volume] in Plasma --pre or post XXX challenge
Corticotropin^pre or post XXX challenge
ACTH; Adrenocorticotrophic hormone; Adrenocorticotropin; After; Before; c206; c74; CHEMISTRY.CHALLENGE TESTING; Cortrosyn; Level; p chal; Pl; Plasma; Plsm; Point in time; pre/p chal; PST; QNT; Quan; Quant; Quantitative; Random; Rc206; Substance concentration; Tumor marker

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

Corticotropin pre or post Unsp challenge (P) [Moles/Vol]Corticotropin [Moles/volume] in Plasma --pre or post XXX challengeACTH pre/p chal Plas-sCncCorticotropin^pre or post XXX challengeCHALCorticotropin before Or after challenge, BloodSCnc

Frequently asked questions

Code details

Code51423-2

SystemLOINC

Display nameCorticotropin pre or post Unsp challenge (P) [Moles/Vol]

DescriptionCorticotropin^pre or post XXX challenge

Short nameACTH pre/p chal Plas-sCnc

ComponentCorticotropin^pre or post XXX challenge

PropertySCnc

TimingPt

System (specimen)Plas

ScaleQn

ClassCHAL

Example unitspmol/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.70

Consumer names

Corticotropin before Or after challenge, Blood

Part names

Corticotropin^pre or post XXX challengeSCncPtPlasQnSubstance ConcentrationPoint in time (spot)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.