Visceral adipose tissue is an estimate from DEXA scans and is a significant indicator of risk.

“the next thing that you get is an estimate of vat or visceral adipose tissue and um again I won't go into how this is done but it is clearly just an estimate and it's based on looking at the amount of fat that is in the Torso above the anterior superior iliac crest and the ribs and kind of trying to subtract out what it believes is in the subcutaneous space and therefore looking at the difference and as you'll see visceral fat is a relatively small fraction of total body fat but it's important to get that right because it's so much more indicative of risk”