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 79956-9: Aortic valve Effective orifice area during systole by US.doppler+Calculated by continuity Vmax

Name: LOINC Code 79956-9: Aortic valve Effective orifice area during systole by US.doppler+Calculated by continuity Vmax
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:01.838Z

79956-9 is a LOINC code used to identify Aortic valve Effective orifice area during systole by US.doppler+Calculated by continuity Vmax 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 Effective orifice area.systole. It is commonly used with the system or sample type Aortic valve.

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 Effective orifice area.systole. It is commonly used with the system or sample type Aortic valve.

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.doppler+Calculated by continuity Vmax

What it does not mean

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

Key facts

Aortic valve Effective orifice area during systole by US.doppler+Calculated by continuity Vmax
Effective orifice area.systole
AO; AoV; AV; AVA; Calc; Calculation; CARD.US; CARD.US.DICOM; Cardio; Cardiology; DOP; DUPLEX; Echography; EOA sys; Heart Disease; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; Sys; Syst; ULS; Ultrasound

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 Effective orifice area during systole by US.doppler+Calculated by continuity VmaxAV EOA sys Continuity VmaxEffective orifice area.systoleCARD.US.DICOMAreaPtAortic valve

Frequently asked questions

Code details

Code79956-9

SystemLOINC

Display nameAortic valve Effective orifice area during systole by US.doppler+Calculated by continuity Vmax

DescriptionEffective orifice area.systole

Short nameAV EOA sys Continuity Vmax

ComponentEffective orifice area.systole

PropertyArea

TimingPt

System (specimen)Aortic valve

ScaleQn

MethodUS.doppler+Calculated by continuity Vmax

ClassCARD.US.DICOM

Example unitscm2

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.67

Part names

Effective orifice area.systoleAreaPtAortic valveQnUS.doppler+Calculated by continuity VmaxEffective orifice area during systolePoint in time (spot)

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.