Appendicular lean mass index (ALMI), measured by DEXA, is a common metric used to assess muscle mass and correlate it with survival curves.

“the final thing that it gives you is uh sometimes it does this directly it just tells you the appendicular lean mass index and sometimes you just have to calculate it and you can always calculate the fat-free mass index what both of which we'll talk about so these are measures of how much lean mass you have or muscle mass in the extremities and the way this is always reported is total amount of lean tissue divided by height in meters squared so both appendicular lean mass index and fat-free mass index which is just total mass that is not fat divided by height in meters squared they're both reported therefore in kilograms per meter squared”