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 80078-9: Right atrial Minor axis at end systole (by US.2D.A4C)/Body surface area

Name: LOINC Code 80078-9: Right atrial Minor axis at end systole (by US.2D.A4C)/Body surface area
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.839Z

80078-9 is a LOINC code used to identify Right atrial Minor axis at end systole (by US.2D.A4C)/Body surface area 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 Minor axis.end systole/Body surface area. It is commonly used with the system or sample type Heart.atrium.right.

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 Minor axis.end systole/Body surface area. It is commonly used with the system or sample type Heart.atrium.right.

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: US.2D.A4C

What it does not mean

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

Key facts

Right atrial Minor axis at end systole (by US.2D.A4C)/Body surface area
Minor axis.end systole/Body surface area
2D US; Atrial; Bdy surface; bod; Bodies; BSA; CARD.US; CARD.US.DICOM; Cardiac; Cardio; Cardiology; Echography; ES; ES minor axis; Heart Disease; Hrt; Point in time; QNT; Quan; Quant; Quantitative; R; RA; RAA; Random; RT; SAX; short axis; Sonogram; Sonograph; Sonography; Surf; Sys; Syst; ULS; Ultrasound; Ultrasound - 2-dimensional

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

Right atrial Minor axis at end systole (by US.2D.A4C)/Body surface areaRA ES minor axis (A4C)/BSAMinor axis.end systole/Body surface areaCARD.US.DICOMArLenPtHeart.atrium.right

Frequently asked questions

Code details

Code80078-9

SystemLOINC

Display nameRight atrial Minor axis at end systole (by US.2D.A4C)/Body surface area

DescriptionMinor axis.end systole/Body surface area

Short nameRA ES minor axis (A4C)/BSA

ComponentMinor axis.end systole/Body surface area

PropertyArLen

TimingPt

System (specimen)Heart.atrium.right

ScaleQn

MethodUS.2D.A4C

ClassCARD.US.DICOM

Example unitscm/m2

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Part names

Minor axis.end systole/Body surface areaArLenPtHeart.atrium.rightQnUS.2D.A4CLength/AreaPoint in time (spot)Heart.atrium Right

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.