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 79940-3: Aortic valve annulus Diameter at end systole by US 2D

Name: LOINC Code 79940-3: Aortic valve annulus Diameter at end systole by US 2D
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.838Z

79940-3 is a LOINC code used to identify Aortic valve annulus Diameter at end systole by US 2D 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 Diameter.end systole. It is commonly used with the system or sample type Aortic valve.annulus.

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 Diameter.end systole. It is commonly used with the system or sample type Aortic valve.annulus.

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

What it does not mean

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

Key facts

Aortic valve annulus Diameter at end systole by US 2D
Diameter.end systole
2D US; AO; AoV; AV; AV ann; CARD.US; CARD.US.DICOM; Cardio; Cardiology; DIA; Diam; Echography; ES; ES diameter; Heart Disease; Length; 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

Aortic valve annulus Diameter at end systole by US 2DAV ann ES diameter 2D USDiameter.end systoleCARD.US.DICOMLenPtAortic valve.annulus

Frequently asked questions

Code details

Code79940-3

SystemLOINC

Display nameAortic valve annulus Diameter at end systole by US 2D

DescriptionDiameter.end systole

Short nameAV ann ES diameter 2D US

ComponentDiameter.end systole

PropertyLen

TimingPt

System (specimen)Aortic valve.annulus

ScaleQn

MethodUS.2D

ClassCARD.US.DICOM

Example unitscm

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Part names

Diameter.end systoleLenPtAortic valve.annulusQnUS.2DDiameter at end systoleLengthPoint in time (spot)Aortic valve annulusUltrasound 2D

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.