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 78901-6: Percent stenosis of Posterior descending branch from right coronary artery by Cardiac angiogram

Name: LOINC Code 78901-6: Percent stenosis of Posterior descending branch from right coronary artery by Cardiac angiogram
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:00.207Z

78901-6 is a LOINC code used to identify Percent stenosis of Posterior descending branch from right coronary artery by Cardiac angiogram 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 Stenosis degree. It is commonly used with the system or sample type Posterior descending from right coronary artery.

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 Stenosis degree. It is commonly used with the system or sample type Posterior descending from right coronary artery.

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
Method: Angiogram

What it does not mean

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

Key facts

Percent stenosis of Posterior descending branch from right coronary artery by Cardiac angiogram
Stenosis degree
Ang; Angio; Angm; Art; CARD.PROC; Cardio; Cardiology; Coronary segment 4; Heart Disease; Length Fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; R; Random; R-PDA; RT; Sten deg

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

Percent stenosis of Posterior descending branch from right coronary artery by Cardiac angiogramPercent sten of R-PDA by AngiogramStenosis degreeCARD.PROCLenFrPtPosterior descending from right coronary artery

Frequently asked questions

Code details

Code78901-6

SystemLOINC

Display namePercent stenosis of Posterior descending branch from right coronary artery by Cardiac angiogram

DescriptionStenosis degree

Short namePercent sten of R-PDA by Angiogram

ComponentStenosis degree

PropertyLenFr

TimingPt

System (specimen)Posterior descending from right coronary artery

ScaleQn

MethodAngiogram

ClassCARD.PROC

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Part names

Stenosis degreeLenFrPtPosterior descending from right coronary arteryQnAngiogramLength fractionPoint in time (spot)Posterior descending branch from right coronary arteryCardiac angiogram

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.