ECF volume assessment can be done most accurately by
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- Sucrose
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- Mannitol
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- Inulin
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- Aminopyrine
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Indicators used for fluid volumes
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Total body water (TBW)- Deuterium Oxide D2O, Tritium oxide, Aminopyrine, Antipyrine
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ECF- Inulin, Sucrose, Mannitol, Sodium thiosulphate, Na22
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Plasma volume- Evan’s blue, radioactive iodine labelled serum albumin (I125)
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Blood cell volume- Cr51 labelled RBC
The most accurate indicator for ECF volume assessment is Inulin.