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.

LOINCActiveBoth

LOINC Code 79450-3: Adenine phosphoribosyltransferase (RBC) [Catalytic activity/Moles]

Name: LOINC Code 79450-3: Adenine phosphoribosyltransferase (RBC) [Catalytic activity/Moles]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.837Z

79450-3 is a LOINC code used to identify Adenine phosphoribosyltransferase (RBC) [Catalytic activity/Moles] 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 Adenine phosphoribosyltransferase. 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 Adenine phosphoribosyltransferase. 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: Both

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Adenine phosphoribosyltransferase [Enzymatic activity/substance] in Red Blood Cells
Adenine phosphoribosyltransferase
Adenine transaminase; APRT; B4 Hemosan; Chemistry; Erythrocytes; Leuco-4; Point in time; QNT; Quan; Quant; Quantitative; Random; Red blood cells; Red blood corpusles; Vit B4; Vitamin B4

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

Adenine phosphoribosyltransferase (RBC) [Catalytic activity/Moles]Adenine phosphoribosyltransferase [Enzymatic activity/substance] in Red Blood CellsAPRT cSub RBCAdenine phosphoribosyltransferaseCHEMAdenine phosphoribosyltransferase, Red blood cellsCSub

Frequently asked questions

Code details

Code79450-3

SystemLOINC

Display nameAdenine phosphoribosyltransferase (RBC) [Catalytic activity/Moles]

DescriptionAdenine phosphoribosyltransferase

Short nameAPRT cSub RBC

ComponentAdenine phosphoribosyltransferase

PropertyCSub

TimingPt

System (specimen)RBC

ScaleQn

ClassCHEM

Example unitsmmol/H/mmol Hb

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Consumer names

Adenine phosphoribosyltransferase, Red blood cells

Part names

Adenine phosphoribosyltransferaseCSubPtRBCQnCatalytic substancePoint 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.