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LOINC Code 77923-1: Left ventricular Myocardial mass/Height exp 2.7 [Mass/Area] by US.2D+Calculated by truncated ellipsoid method

77923-1 is a LOINC code used to identify Left ventricular Myocardial mass/Height exp 2.7 [Mass/Area] by US.2D+Calculated by truncated ellipsoid method 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 Myocardial mass/Height exp 2.7. 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 Myocardial mass/Height exp 2.7. 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+Calculated by truncated ellipsoid method

What it does not mean

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

Key facts

Left ventricular Myocardial mass/Height exp 2.7 [Mass/Area] by US.2D+Calculated by truncated ellipsoid method
Myocardial mass/Height exp 2.7
The myocardial index is the left ventricular (LV) mass normalized for body size, which can be approximated by different measures including body surface area (BSA) and height. This term represents an index based on height^2.7. Left ventricular mass calculated by the truncated ellipsoid formula on 2D ultrasound is as follows1.05 * Pi * {(b+t)^2 * [2/3 * (a+t)+d-d^3/(3 * (a+t))^2] - b^2 * [2/3 * a + d - d^3/(3 * a^2)]}, where a = distance from the minor axis to the endocardium at the LV apex, b = LV minor radius, t = mean wall thickness, and d = distance from the minor axis to the mitral valve plane. [PMID: 25559473]
2D US; Calc; Calculation; CARD.US; Cardiac; Cardio; Cardiology; Echography; Heart Disease; Hrt; Hrt ventr; L; LT; LV; MAric; Myo mass; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Ultrasound - 2-dimensional; US.2D+trunc ellips; 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 Myocardial mass/Height exp 2.7 [Mass/Area] by US.2D+Calculated by truncated ellipsoid methodLV Myo/Ht exp 2.7 US.2D+trunc ellipsMyocardial mass/Height exp 2.7CARD.USArMassPtHeart.ventricle.left

Frequently asked questions

Code details

Code77923-1
SystemLOINC
Display nameLeft ventricular Myocardial mass/Height exp 2.7 [Mass/Area] by US.2D+Calculated by truncated ellipsoid method
DescriptionMyocardial mass/Height exp 2.7
Short nameLV Myo/Ht exp 2.7 US.2D+trunc ellips
ComponentMyocardial mass/Height exp 2.7
PropertyArMass
TimingPt
System (specimen)Heart.ventricle.left
ScaleQn
MethodUS.2D+Calculated by truncated ellipsoid method
ClassCARD.US
Example unitsg/m2.7
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.52
Last changed2.56

Part names

Myocardial mass/Height exp 2.7ArMassPtHeart.ventricle.leftQnUS.2D+Calculated by truncated ellipsoid methodMass/AreaPoint in time (spot)Heart ventricle - 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.