77921-5
ClinicalLeft ventricular Myocardial mass/Height exp 2.7 [Mass/Area] by US.M-mode+Calculated by cube 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. The cube function is a method for calculating left ventricular mass from M-mode echocardiography measurements and assumes a long- to short-axis length ratio of 2:1. The formula is as follows: LV mass = 1.04(IVSd + LVIDd + PWTd)^3 - LVID^3), where IVSd = interventricular septal thickness, LVIDd = left ventricular internal diameter (short axis), and PWTd = posterior wall thickness, all measured during end-diastole. [PMID: 2936235]
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.M-mode+Calculated by cube method
Details
Class
CARD.US
Order/Observation
Observation
Short Name
LV Myo/Ht exp 2.7 US.M-mode+cube
Related Names
Frequently Asked Questions
What is LOINC code 77921-5?
LOINC code 77921-5 identifies "Left ventricular Myocardial mass/Height exp 2.7 [Mass/Area] by US.M-mode+Calculated by cube 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. The cube function is a method for calculating left ventricular mass from M-mode echocardiography measurements and assumes a long- to short-axis length ratio of 2:1. The formula is as follows: LV mass = 1.04(IVSd + LVIDd + PWTd)^3 - LVID^3), where IVSd = interventricular septal thickness, LVIDd = left ventricular internal diameter (short axis), and PWTd = posterior wall thickness, all measured during end-diastole. [PMID: 2936235]
What does 77921-5 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.