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 42320-2: Glutathione reductase phenotype (RBC) [Interp]

Name: LOINC Code 42320-2: Glutathione reductase phenotype (RBC) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:28.127Z

42320-2 is a LOINC code used to identify Glutathione reductase phenotype (RBC) [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 Glutathione reductase phenotype. It is commonly used with the system or sample type RBC.

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 Glutathione reductase phenotype. It is commonly used with the system or sample type RBC.

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

Glutathione reductase phenotype [Interpretation] in Red Blood Cells
Glutathione reductase phenotype
Chemistry; Erythrocytes; GR; GR Phenotyp; GSR; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Nominal; Point in time; Random; Red blood cells; Red blood corpusles

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

Glutathione reductase phenotype (RBC) [Interp]Glutathione reductase phenotype [Interpretation] in Red Blood CellsGR Phenotyp RBC-ImpGlutathione reductase phenotypeCHEMGlutathione reductase phenotype, Red blood cellsImp

Frequently asked questions

Code details

Code42320-2

SystemLOINC

Display nameGlutathione reductase phenotype (RBC) [Interp]

DescriptionGlutathione reductase phenotype

Short nameGR Phenotyp RBC-Imp

ComponentGlutathione reductase phenotype

PropertyImp

TimingPt

System (specimen)RBC

ScaleNom

ClassCHEM

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.26

Consumer names

Glutathione reductase phenotype, Red blood cells

Part names

Glutathione reductase phenotypeImpPtRBCNomImpression/interpretation of studyPoint in time (spot)Red Blood Cells

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.