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 12823-1: Prolactin 2nd specimen post Unsp challenge [Mass/Vol]

Name: LOINC Code 12823-1: Prolactin 2nd specimen post Unsp challenge [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:23.605Z

12823-1 is a LOINC code used to identify Prolactin 2nd specimen post Unsp challenge [Mass/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 Prolactin^2nd specimen post XXX challenge. 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 Prolactin^2nd specimen post XXX challenge. 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

Prolactin [Mass/volume] in Serum or Plasma --2nd specimen post XXX challenge
Prolactin^2nd specimen post XXX challenge
After; CHEMISTRY.CHALLENGE TESTING; Convalescent; Lactotropic hormone; Lactotropin; Level; Mammatropic hormone; Mammotropin; Mass concentration; p chal; Pl; Plasma; Plsm; Point in time; Post immunization; PRL; Prol; PST; QNT; Quan; Quant; Quantitative; Random; Second; SerP; SerPl; SerPlas; Serum; Serum or plasma; sp2; sp2 p chal; Spec; SR

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

Prolactin 2nd specimen post Unsp challenge [Mass/Vol]Prolactin [Mass/volume] in Serum or Plasma --2nd specimen post XXX challengeProlactin sp2 p chal SerPl-mCncProlactin^2nd specimen post XXX challengeCHALProlactin 2nd specimen after challenge, BloodMCnc

Frequently asked questions

Code details

Code12823-1

SystemLOINC

Display nameProlactin 2nd specimen post Unsp challenge [Mass/Vol]

DescriptionProlactin^2nd specimen post XXX challenge

Short nameProlactin sp2 p chal SerPl-mCnc

ComponentProlactin^2nd specimen post XXX challenge

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsng/mL;ug/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.73

Consumer names

Prolactin 2nd specimen after challenge, Blood

Part names

Prolactin^2nd specimen post XXX challengeMCncPtSer/PlasQnMass 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.