ECF volume assessment can be done

ECF volume assessment can be done most accurately by

    1. Sucrose
    1. Mannitol
    1. Inulin
    1. Aminopyrine

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Indicators used for fluid volumes

  1.   Total body water (TBW)- Deuterium Oxide D2O, Tritium oxide, Aminopyrine, Antipyrine
  2.   ECF- Inulin, Sucrose, Mannitol, Sodium thiosulphate, Na22
  3.   Plasma volume- Evan’s blue, radioactive iodine labelled serum albumin (I125)
  4.   Blood cell volume- Cr51 labelled RBC

The most accurate indicator for ECF volume assessment is Inulin.