77898-5
ClinicalLeft ventricular Myocardial mass/Body surface area [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 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. 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/Body surface area
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 mass/BSA US.M-mode+cube
Related Names
Frequently Asked Questions
What is LOINC code 77898-5?
LOINC code 77898-5 identifies "Left ventricular Myocardial mass/Body surface area [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 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. 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 77898-5 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.