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 33261-9: TSH 2 Hr post dose TRH Qn

Name: LOINC Code 33261-9: TSH 2 Hr post dose TRH Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:20.067Z

33261-9 is a LOINC code used to identify TSH 2 Hr 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 Thyrotropin^2H 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^2H 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

Thyrotropin [Units/volume] in Serum or Plasma --2 hours post dose TRH
Thyrotropin^2H post dose TRH
120 min; 120 minutes; 120min; 2 hours; 2h p TRH; After; Arbitrary concentration; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; 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 2 Hr post dose TRH QnThyrotropin [Units/volume] in Serum or Plasma --2 hours post dose TRHTSH 2h p TRH SerPl-aCncThyrotropin^2H post dose TRHCHALThyroid Stimulating Hormone (TSH; Thyrotropin) 2 hr after TRH, BloodACnc

Frequently asked questions

Code details

Code33261-9

SystemLOINC

Display nameTSH 2 Hr post dose TRH Qn

DescriptionThyrotropin^2H post dose TRH

Short nameTSH 2h p TRH SerPl-aCnc

ComponentThyrotropin^2H post dose TRH

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsmIU/L;mcU/mL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.70

Consumer names

Thyroid Stimulating Hormone (TSH; Thyrotropin) 2 hr after TRH, Blood

Part names

Thyrotropin^2H 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.