Interstitial fluid volume can be measure by: (A) Tritium oxide - Sodium thiosulfate, (B) Inulin - Radioactive sodium, (C) Aminopyrine - Sucrose, (D) Inulin - Sodium albumin labelled with radioactive Iodine.
Answer is D. Interstitial fluid volume cannot be calculated directly. It is measure as ECF volume. Plasma volume
ECF volume calculated by Inulin. Plasma volume calculated by Serum albumin labelled with radioactive Iodine.