D2O is used to determine-: (A) ICF, (B) ECF, (C) Total body water, (D) Plasma volume
Answer is C. 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