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 1634-5: Somatotropin 52 Hr post 250 ug L-dopa TID 2day PO [Mass/Vol]

Name: LOINC Code 1634-5: Somatotropin 52 Hr post 250 ug L-dopa TID 2day PO [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:26.376Z

1634-5 is a LOINC code used to identify Somatotropin 52 Hr post 250 ug L-dopa TID 2day PO [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 Somatotropin^52H post 250 ug L-Dopa TID 2day PO. 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^52H post 250 ug L-Dopa TID 2day PO. 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 [Mass/volume] in Serum or Plasma --52 hours post 250 ug L-dopa TID 2day PO
Somatotropin^52H post 250 ug L-Dopa TID 2day PO
52h p 250 ug L-D TID 2D PO; After; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; GH; Growth hormone; HGH; Human growth hormone; Left; Level; Levo; Mass concentration; mcg; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; Somatotropic hormone; SR; STH; three times a day

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 52 Hr post 250 ug L-dopa TID 2day PO [Mass/Vol]Somatotropin [Mass/volume] in Serum or Plasma --52 hours post 250 ug L-dopa TID 2day POGH 52h p 250 ug L-D TID 2D PO SerPl-mCncSomatotropin^52H post 250 ug L-Dopa TID 2day POCHALSomatotropin 52 hr after 250 ug L-dopa TID 2day by mouth, BloodMCnc

Frequently asked questions

Code details

Code1634-5

SystemLOINC

Display nameSomatotropin 52 Hr post 250 ug L-dopa TID 2day PO [Mass/Vol]

DescriptionSomatotropin^52H post 250 ug L-Dopa TID 2day PO

Short nameGH 52h p 250 ug L-D TID 2D PO SerPl-mCnc

ComponentSomatotropin^52H post 250 ug L-Dopa TID 2day PO

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsug/L;ng/mL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.40

Consumer names

Somatotropin 52 hr after 250 ug L-dopa TID 2day by mouth, Blood

Part names

Somatotropin^52H post 250 ug L-Dopa TID 2day POMCncPtSer/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.