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 49688-5: Glucose tolerance post 75 g glucose PO Nar [Interp]

Name: LOINC Code 49688-5: Glucose tolerance post 75 g glucose PO Nar [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:33.942Z

49688-5 is a LOINC code used to identify Glucose tolerance post 75 g glucose PO Nar [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^post 75 g glucose 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 Glucose tolerance^post 75 g glucose 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

Glucose tolerance [Interpretation] in Serum or Plasma Narrative--post 75 g glucose PO
Glucose tolerance^post 75 g glucose PO
75Gm; After; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; Glu; Glu tol; Gluc; Glucose tolerance; Glucoseur; GTT; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Narrative; p 75 g Glc PO; Pl; Plasma; Plsm; Point in time; PST; Random; Report; 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 post 75 g glucose PO Nar [Interp]Glucose tolerance [Interpretation] in Serum or Plasma Narrative--post 75 g glucose POGTT p 75 g Glc PO SerPl-ImpGlucose tolerance^post 75 g glucose POCHALInterpretation of Glucose tolerance after 75 g glucose by mouth test result, BloodImp

Frequently asked questions

Code details

Code49688-5

SystemLOINC

Display nameGlucose tolerance post 75 g glucose PO Nar [Interp]

DescriptionGlucose tolerance^post 75 g glucose PO

Short nameGTT p 75 g Glc PO SerPl-Imp

ComponentGlucose tolerance^post 75 g glucose PO

PropertyImp

TimingPt

System (specimen)Ser/Plas

ScaleNar

ClassCHAL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.73

Consumer names

Interpretation of Glucose tolerance after 75 g glucose by mouth test result, Blood

Part names

Glucose tolerance^post 75 g glucose POImpPtSer/PlasNarImpression/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.