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 47900-6: Somatotropin 20 Min post dose TRH Qn

Name: LOINC Code 47900-6: Somatotropin 20 Min post dose TRH Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:32.262Z

47900-6 is a LOINC code used to identify Somatotropin 20 Min post dose TRH Qn 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 Somatotropin^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 Somatotropin^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: ACTIVE
Order vs observation: Observation

What it does not mean

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

Key facts

Somatotropin [Units/volume] in Serum or Plasma --20 minutes post dose TRH
Somatotropin^20M post dose TRH
20M p TRH; After; Arbitrary concentration; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; GH; Growth hormone; HGH; Human growth hormone; p dose; p TRH; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; Somatotropic hormone; SR; STH

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

Somatotropin 20 Min post dose TRH QnSomatotropin [Units/volume] in Serum or Plasma --20 minutes post dose TRHGH 20M p TRH SerPl-aCncSomatotropin^20M post dose TRHCHALSomatotropin 20 min after TRH, BloodACnc

Frequently asked questions

Code details

Code47900-6

SystemLOINC

Display nameSomatotropin 20 Min post dose TRH Qn

DescriptionSomatotropin^20M post dose TRH

Short nameGH 20M p TRH SerPl-aCnc

ComponentSomatotropin^20M post dose TRH

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsmIU/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.21

Last changed2.70

Consumer names

Somatotropin 20 min after TRH, Blood

Part names

Somatotropin^20M post dose TRHACncPtSer/PlasQnArbitrary 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.