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 57557-1: 18-Hydroxycortisol pre dose corticotropin [Moles/Vol]

Name: LOINC Code 57557-1: 18-Hydroxycortisol pre dose corticotropin [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.757Z

57557-1 is a LOINC code used to identify 18-Hydroxycortisol pre dose corticotropin [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 18-Hydroxycortisol^pre dose corticotropin. 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 18-Hydroxycortisol^pre dose corticotropin. 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: Observation

What it does not mean

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

Key facts

18-Hydroxycortisol [Moles/volume] in Serum or Plasma --pre dose corticotropin
18-Hydroxycortisol^pre dose corticotropin
18OH-Cortis; ACTH; Adrenocorticotrophic hormone; Adrenocorticotropin; Before; c206; c74; CHEMISTRY.CHALLENGE TESTING; Cortrosyn; Level; Pl; Plasma; Plsm; Point in time; Pre ACTH; QNT; Quan; Quant; Quantitative; Random; Rc206; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; 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

18-Hydroxycortisol pre dose corticotropin [Moles/Vol]18-Hydroxycortisol [Moles/volume] in Serum or Plasma --pre dose corticotropin18OH-Cortis Pre ACTH SerPl-sCnc18-Hydroxycortisol^pre dose corticotropinCHAL18-Hydroxycortisol before dose Corticotropin, BloodSCnc

Frequently asked questions

Code details

Code57557-1

SystemLOINC

Display name18-Hydroxycortisol pre dose corticotropin [Moles/Vol]

Description18-Hydroxycortisol^pre dose corticotropin

Short name18OH-Cortis Pre ACTH SerPl-sCnc

Component18-Hydroxycortisol^pre dose corticotropin

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitspmol/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.70

Consumer names

18-Hydroxycortisol before dose Corticotropin, Blood

Part names

18-Hydroxycortisol^pre dose corticotropinSCncPtSer/PlasQnSubstance 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.