LOINCActiveObservation

LOINC Code 21004-7: Glucose tolerance [Interp]

21004-7 is a LOINC code used to identify Glucose tolerance [Interp] 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 Glucose tolerance. 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 Glucose tolerance. 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

  • Glucose tolerance [Interpretation] in Serum or Plasma
  • Glucose tolerance
  • CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; Glu; Glu tol; Gluc; Glucose tolerance; Glucoseur; GTT; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Nominal; Pl; Plasma; Plsm; Point in time; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; 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

Glucose tolerance [Interp]Glucose tolerance [Interpretation] in Serum or PlasmaGTT SerPl-ImpGlucose toleranceCHALGlucose tolerance, BloodImp

Frequently asked questions

Code details

Code21004-7
SystemLOINC
Display nameGlucose tolerance [Interp]
DescriptionGlucose tolerance
Short nameGTT SerPl-Imp
ComponentGlucose tolerance
PropertyImp
TimingPt
System (specimen)Ser/Plas
ScaleNom
ClassCHAL
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0m
Last changed2.73

Consumer names

Glucose tolerance, Blood

Part names

Glucose toleranceImpPtSer/PlasNomImpression/interpretation of studyPoint 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.

LOINC Code 21004-7 | HealthAssure