No EP or USP monograph for iobitridol is available though similar substances such as iodixanol, iohexol, iopamidol, iopromide, iotrolan, iopanoic acid, iotalamic acid and ioxaglic acid are reported in EP. For the large majority of them the assay is estimated by potentiometric titration of iodine after a work up consisting of three operational steps (reduction by Zn, boiling, filtration).