<prompt> Interstitial fluid volume can be measure byTritium oxide - Sodium thiosulfateInulin - Radioactive sodiumAminopyrine - SucroseInulin - Sodium albumin labelled with radioactive Iodine.  <response>: Interstitial fluid volume cannot be calculated directly. It is measure as ECF volume. Plasma volumeECF volume calculated by Inulin. Plasma volume calculated by Serum albumin labelled with radioactive Iodine. 