77899-3
ClinicalLeft ventricular Myocardial mass/Body surface area [Mass/Area] by US.2D+Calculated by truncated ellipsoid method
Definition
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 a BSA-based index. BSA can be calculated by a number of methods including the Mostellar and Du Bois formulas, or in some cases the average adult BSA, 1.73 m2, is used by default. Left ventricular mass calculated by the truncated ellipsoid formula on 2D ultrasound is as follows: 1.05 * 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]
LOINC 6-Axis Classification
Component
Myocardial mass/Body surface area
Property
ArMass
Time Aspect
Pt
System
Heart.ventricle.left
Scale Type
Qn
Method Type
US.2D+Calculated by truncated ellipsoid method
Details
Class
CARD.US
Order/Observation
Observation
Short Name
LV Myo mass/BSA US.2D+trunc ellips
Related Names
Frequently Asked Questions
What is LOINC code 77899-3?
LOINC code 77899-3 identifies "Left ventricular Myocardial mass/Body surface area [Mass/Area] by US.2D+Calculated by truncated ellipsoid method". 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 a BSA-based index. BSA can be calculated by a number of methods including the Mostellar and Du Bois formulas, or in some cases the average adult BSA, 1.73 m2, is used by default. Left ventricular mass calculated by the truncated ellipsoid formula on 2D ultrasound is as follows: 1.05 * 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]
What does 77899-3 measure?
This code measures Myocardial mass/Body surface area in Heart.ventricle.left. It belongs to the CARD.US class in the LOINC classification.
What is LOINC?
LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.