Technetium Tc 99m (Pyro-and trimeta-)Phosphates Injection »Technetium Tc 99m (Pyro-and trimeta-)Phosphates Injection is a sterile,aqueous solution,suitable for intravenous administration,composed of sodium pyrophosphate,sodium trimetaphosphate,and stannous chloride labeled with radioactive Tc 99m.It contains not less than 90.0percent and not more than 110.0percent of the labeled amount of 99mTc as phosphate expressed in megabecquerels (microcuries or millicuries)per mLat the time indicated in the labeling.Other chemical forms of radioactivity do not exceed 10.0percent of the total radioactivity. USP Reference standards á11ñ USP Endotoxin RS. pHá791ñ: between 4.0and 7.0. Radiochemical purity— Place a measured volume of Injection,appropriately diluted,such that it provides a count rate of about 20,000counts per minute,about 10mm from one end of a 10-×50-mm strip of chromatographic paper (see Chromatography á621ñ),and immediately develop the chromatogram over a period of 3to 5minutes by ascending chromatography,using saline TS,and air-dry.Determine the radioactivity distribution by scanning with a suitable collimated radiation detector.Not more than 10.0%of the total radioactivity is found at the point of application.Similarly prepare a second strip,and thoroughly dry the spot with nitrogen.Develop the chromatogram over a period of 35to 45seconds by ascending chromatography,using freshly distilled methyl ethyl ketone,and allow to dry.Determine the radioactivity distribution as previously directed.Not less than 90.0%of the total radioactivity is found at the point of application. Other requirements— It meets the requirements of the tests for Radionuclide identificationand Radionuclidic purityunder Sodium Pertechnetate Tc 99m Injection,and the requirements of the tests for Packaging and storage,Labeling,Bacterial endotoxins,Biological distribution,and Assay for radioactivityunder Technetium Tc 99m Pyrophosphate Injection.It meets the requirements under Injections á1ñ,except that it may be distributed or dispensed prior to completion of the test for Sterility,the latter test being started on the day of manufacture,and except that it is not subject to the recommendation on Volume in Container. Auxiliary Information— Staff Liaison:Andrzej Wilk,Ph.D.,Senior Scientific Associate Expert Committee:(RMI)Radiopharmaceuticals and Medical Imaging Agents USP28–NF23Page 1862 Phone Number:1-301-816-8305