77923-1
ClinicalLeft ventricular Myocardial mass/Height exp 2.7 [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 an index based on height^2.7. 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/Height exp 2.7
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/Ht exp 2.7 US.2D+trunc ellips
Related Names
Frequently Asked Questions
What is LOINC code 77923-1?
LOINC code 77923-1 identifies "Left ventricular Myocardial mass/Height exp 2.7 [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 an index based on height^2.7. 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 77923-1 measure?
This code measures Myocardial mass/Height exp 2.7 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.