This lv mass index calculator takes the figures you already have and applies the relationship behind lv mass index calculations for you, giving relative wall thickness (rwt), left ventricular mass and body surface area from height, ivsd, lvedd, pwd and weight.
What Is the LV Mass Index Calculator?
The lv mass index calculator gives you an estimate of relative wall thickness (rwt), left ventricular mass and body surface area based on height, ivsd, lvedd, pwd and weight.
It is a quick reference figure rather than a diagnosis, and it is most useful for tracking how a number moves over time rather than for interpreting a single reading.
How the LV Mass Index Estimate Is Worked Out
The calculation follows published reference relationships, so it is a reasonable approximation when the inputs are accurate. It assumes an average adult and does not account for individual variation.
If you are comparing two people, or the same person over a period of weeks, keep the method and the inputs identical. A change in the method can easily look like a change in the person.
What This Calculator Does Not Do
It does not diagnose anything, and it does not replace advice from a clinician. If a figure comes out at an extreme, or if it differs sharply from what you expect, that is a reason to speak to a professional rather than to adjust the inputs.
Nothing you type here is stored or sent anywhere. The whole calculation happens in your browser.
A Worked Example
Working through an example, with height set to 10, ivsd set to 5, lvedd set to 2, the calculator returns left ventricular mass of 1,019,229.72, and relative wall thickness (rwt) of 100, and body surface area of 0.16667. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out relative wall thickness (rwt)?
Enter height, ivsd, lvedd, pwd and weight. The calculator then works through the relationship and reports relative wall thickness (rwt), left ventricular mass and body surface area.
What does the lv mass index actually calculate?
It takes height, ivsd, lvedd, pwd and weight and converts them into relative wall thickness (rwt), left ventricular mass and body surface area using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter height?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.