<prompt> Most accurate measurement of extracellular fluid volume ECF can be done by using :Sucrose.Mannitol.Inulin.Aminopyrine  <response>: Ans. is c i.e. Inulin First lets see different types of body fluid.Extracellular fluid - It is a general term for all the body fluids outside the cells.It consists ofInterstitial fluidPlasmaLymphCerebrospinal fluidIntracellular fluidPortion of total body fluid which are within the cell membranesMeasurement of body fluid volumesExtracellular fluid volume -It is most accurately measured by InulinIt can also be measured bymannitolsucrosePlasma volume- It is measured byEvans blueAlbumin labelled with radioactive iodineTotal body fluid - It can be measured byD2O most frequently usedTritium oxideAmino pyrineInterstitial fluid volume and intracellular fluid volume cannot be measured directly. These volume are calculates by.Interstitial fluid volume ECF - plasma volumeIntracellular fluid volume Total body fluid - Extracellular fluidAlso Remember Distribution of body fluid volumeTotal body water 60 of body weight 42 L in a 70 kg man.I CF 40 of body weight 28 L in a 70 kg manECF 20 of body weight 14L in a 70 kg manInterstitial fluid 15 of body weight 10.5 L in a 70 kg manBlood volume 8 body weight 5.5 L in a 70 kg manPlasma volume 5 of body weight 3.5 L in a 70 kg man 