system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
D2O is used to determine-
assistant
The correct answer is  Volume Indicators Total body water 3H2O, 2H2O, Antipyrine Extracellular fluid 22Na, 125I-iothalamate, thiosulphate, inulin ICF (calculated as TBW-ECF) Plasma volume 125I-albumin, Evans blue dye Interstitial fluid (calculated as ECF-plasma volume) Blood volume Cr-labeled red blood cells