BodyMetrix uses skinfold caliper formulas in a new and innovative way. Ultrasound measures the subcutaneous fat thickness at each of the skinfold sites. Powerful software calculates algorithms of such standards as Durnin & Worsley. The benefits of skinfold methodologies are well tested. Ultrasound is a new way of acquiring the data. Ultrasound doesn’t present the same negatives that bio-impedance does including consistent hydrated levels. The BodyMetrix correlates well to methods such as DEXA, Skinfold Calipers and BodPod.