Ultrasound method of the USVALID study to measure subcutaneous adipose tissue and muscle thickness on the thigh and upper arm: An illustrated step-by-step guide

So far there is no standardised widely accepted ultrasound method for assessment of both subcutaneous adipose tissue and muscle mass in healthy subjects, patients and ICU patients. The goal is to provide an illustrated step-by-step guide of the ultrasound method developed since 2011, refined and applied during the USVALID study.