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.

LOINCObservation

LOINC Code 24459-0: TSH 20 Min post dose TRH [Mass/Vol]

Name: LOINC Code 24459-0: TSH 20 Min post dose TRH [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:13.165Z

24459-0 is a LOINC code used to identify TSH 20 Min post dose TRH [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 Thyrotropin^20M post dose TRH. 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 Thyrotropin^20M post dose TRH. 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: DISCOURAGED
Order vs observation: Observation

What it does not mean

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

Key facts

Thyrotropin [Mass/volume] in Serum or Plasma --20 minutes post dose TRH
Thyrotropin^20M post dose TRH
20M p TRH; After; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; Level; Mass concentration; p dose; p TRH; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Thyroid stimulating hormone; Thyrotropic hormone; TSH

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

TSH 20 Min post dose TRH [Mass/Vol]Thyrotropin [Mass/volume] in Serum or Plasma --20 minutes post dose TRHTSH 20M p TRH SerPl-mCncThyrotropin^20M post dose TRHCHALThyroid Stimulating Hormone (TSH; Thyrotropin) 20 min after TRH, BloodMCnc

Frequently asked questions

Code details

Code24459-0

SystemLOINC

Display nameTSH 20 Min post dose TRH [Mass/Vol]

DescriptionThyrotropin^20M post dose TRH

Short nameTSH 20M p TRH SerPl-mCnc

ComponentThyrotropin^20M post dose TRH

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsng/mL

StatusDISCOURAGED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0o

Last changed2.42

Consumer names

Thyroid Stimulating Hormone (TSH; Thyrotropin) 20 min after TRH, Blood

Part names

Thyrotropin^20M post dose TRHMCncPtSer/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.