<prompt> D2O is used to determine-ICFECFTotal body waterPlasma volume  <response>: 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 