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 29439-7: Left ventricular Internal diameter minor axis systole by US.M-mode

Name: LOINC Code 29439-7: Left ventricular Internal diameter minor axis systole by US.M-mode
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:15.474Z

29439-7 is a LOINC code used to identify Left ventricular Internal diameter minor axis systole by US.M-mode 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 Internal diameter.minor axis.systole. 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 Internal diameter.minor axis.systole. 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.M-mode

What it does not mean

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

Key facts

Left ventricular Internal diameter minor axis systole by US.M-mode
Internal diameter.minor axis.systole
CARD.US; Cardiac; Cardio; Cardiology; DIA; Diam; diam S; Diam sys, short; Echography; Heart Disease; Hrt; Hrt ventr; L; Length; LT; LV; LVIDS; Minor axis systole; MM; mmode; Point in time; QNT; Quan; Quant; Quantitative; Random; SAX; short axis; Sonogram; Sonograph; Sonography; Sys; Syst; ULS; Ultrasound; Ventricular

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 Internal diameter minor axis systole by US.M-modeLV Diam sys, short M-modeInternal diameter.minor axis.systoleCARD.USLenPtHeart.ventricle.left

Frequently asked questions

Code details

Code29439-7

SystemLOINC

Display nameLeft ventricular Internal diameter minor axis systole by US.M-mode

DescriptionInternal diameter.minor axis.systole

Short nameLV Diam sys, short M-mode

ComponentInternal diameter.minor axis.systole

PropertyLen

TimingPt

System (specimen)Heart.ventricle.left

ScaleQn

MethodUS.M-mode

ClassCARD.US

Example unitscm

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.03

Last changed2.54

Part names

Internal diameter.minor axis.systoleLenPtHeart.ventricle.leftQnUS.M-modeInternal diameter minor axis systoleLengthPoint in time (spot)Heart ventricle - leftUltrasound.M-mode

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.