As a health and fitness lab we are extremely interested in body composition changes in response to lifestlye habits and exercise. Our lab is equipped with a GE lunar iDXA and a BODPOD. Our version of the iDXA allows us to measure body composition in patients up to 400lbs. We have published findings on the precision of the iDXA in very large patients and have found it to be a highly precise method of measuring body composition in this population. The iDXA in conjunction with updated software allows for the measurement of body composition parameters in isolated regions of the body. This great feature allows us to compute muscle quality indexes for isolated muscle groups.