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 20331-5: Left ventricular Stroke volume 2 chamber by US 2D modified single-plane calculated

Name: LOINC Code 20331-5: Left ventricular Stroke volume 2 chamber by US 2D modified single-plane calculated
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:28.846Z

20331-5 is a LOINC code used to identify Left ventricular Stroke volume 2 chamber by US 2D modified single-plane calculated 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 Cardiac output/Heart rate.2 chamber. It is commonly used with the system or sample type Heart.ventricle.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 Cardiac output/Heart rate.2 chamber. It is commonly used with the system or sample type Heart.ventricle.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.mod.single-plane.calculated

What it does not mean

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

Key facts

Left ventricular Stroke volume 2 chamber by US 2D modified single-plane calculated
Cardiac output/Heart rate.2 chamber
2D US; Calc; Calculation; CARD.US; Cardiac; Cardio; Cardiology; CO; Echography; Heart beat; Heart Disease; Heart rate.2cham; Hrt; Hrt ventr; II; L; LT; LV; Method of discs; Method of disks; MOD-SP; MOD-SP2; Point in time; Pulse; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Ultrasound - 2-dimensional; US.2D.MOD-SP; Ventricular; Volume

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 ventricular Stroke volume 2 chamber by US 2D modified single-plane calculatedLV Stroke volume.2cham US.2D.MOD-SPCardiac output/Heart rate.2 chamberCARD.USVolPtHeart.ventricle.left

Frequently asked questions

Code details

Code20331-5

SystemLOINC

Display nameLeft ventricular Stroke volume 2 chamber by US 2D modified single-plane calculated

DescriptionCardiac output/Heart rate.2 chamber

Short nameLV Stroke volume.2cham US.2D.MOD-SP

ComponentCardiac output/Heart rate.2 chamber

PropertyVol

TimingPt

System (specimen)Heart.ventricle.left

ScaleQn

MethodUS.2D.mod.single-plane.calculated

ClassCARD.US

Example unitsmL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.48

Part names

Cardiac output/Heart rate.2 chamberVolPtHeart.ventricle.leftQnUS.2D.mod.single-plane.calculatedVolumePoint in time (spot)Heart ventricle - leftUltrasound 2D.mod.single-plane.calculated

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.