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 79973-4: Left atrial Area at end systole by US.2D.A2C+Measured by planimetry

Name: LOINC Code 79973-4: Left atrial Area at end systole by US.2D.A2C+Measured by planimetry
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.838Z

79973-4 is a LOINC code used to identify Left atrial Area at end systole by US.2D.A2C+Measured by planimetry 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 Area.end systole. It is commonly used with the system or sample type Heart.atrium.left.

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 Area.end systole. It is commonly used with the system or sample type Heart.atrium.left.

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.A2C+Measured by planimetry

What it does not mean

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

Key facts

Left atrial Area at end systole by US.2D.A2C+Measured by planimetry
Area.end systole
2D US; Atrial; CARD.US; CARD.US.DICOM; Cardiac; Cardio; Cardiology; Echography; ES; ES area; Heart Disease; Hrt; L; LA; LAA; LT; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; 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

Left atrial Area at end systole by US.2D.A2C+Measured by planimetryLA ES area A2CArea.end systoleCARD.US.DICOMAreaPtHeart.atrium.left

Frequently asked questions

Code details

Code79973-4

SystemLOINC

Display nameLeft atrial Area at end systole by US.2D.A2C+Measured by planimetry

DescriptionArea.end systole

Short nameLA ES area A2C

ComponentArea.end systole

PropertyArea

TimingPt

System (specimen)Heart.atrium.left

ScaleQn

MethodUS.2D.A2C+Measured by planimetry

ClassCARD.US.DICOM

Example unitscm2

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Part names

Area.end systoleAreaPtHeart.atrium.leftQnUS.2D.A2C+Measured by planimetryArea at end systolePoint in time (spot)Heart.atrium Left

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.