Test Items Specifications Appearance White to off-white crystalline powder Identification IR Water 1.20% Assay of aztreonam Calculated on the anhydrous and arginine free basis. 96.7% PH 4.8 Clarity and color Conforms Eyeable particulate Conforms Sterility Conforms Bacterial endotoxins Conforms Related substance Total impurities ≤ 5%