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 79465-1: Porphobilinogen synthase (RBC) [Catalytic activity/Mass]

Name: LOINC Code 79465-1: Porphobilinogen synthase (RBC) [Catalytic activity/Mass]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.837Z

79465-1 is a LOINC code used to identify Porphobilinogen synthase (RBC) [Catalytic activity/Mass] 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 Porphobilinogen synthase. 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 Porphobilinogen synthase. 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

Porphobilinogen synthase [Enzymatic activity/mass] in Red Blood Cells
Porphobilinogen synthase
ALA dehydratase; Catalytic Content; Chemistry; Erythrocytes; Hematology; Heme; PBG; PBG Synthase; Point in time; Porph; Porphobili; Porphoblngn; Porpoblngn; QNT; Quan; Quant; Quantitative; 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

Porphobilinogen synthase (RBC) [Catalytic activity/Mass]Porphobilinogen synthase [Enzymatic activity/mass] in Red Blood CellsPBG Synthase RBC-cCntPorphobilinogen synthaseCHEMPorphobilinogen synthase, Red blood cellsCCnt

Frequently asked questions

Code details

Code79465-1

SystemLOINC

Display namePorphobilinogen synthase (RBC) [Catalytic activity/Mass]

DescriptionPorphobilinogen synthase

Short namePBG Synthase RBC-cCnt

ComponentPorphobilinogen synthase

PropertyCCnt

TimingPt

System (specimen)RBC

ScaleQn

ClassCHEM

Example unitsumol/H/g Hb

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Consumer names

Porphobilinogen synthase, Red blood cells

Part names

Porphobilinogen synthaseCCntPtRBCQnCatalytic ContentPoint 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.