what does doubly labeled water measure
ENERGY EXPENDITURE USING DOUBLY LABELLED WATER. Iso-Analytical provides a full range of analytical services for customers wishing to determine Energy Expenditure using doubly labelled water. The Doubly Labelled Water (DLW) method uses the natural occurring stable isotopes of water (D2O and H218O) to assess energy expenditure, body composition and water flux in humans and animals.