ACE® Renal / General Chemistry Creatinine For ACE and ACE Alera Analyzers 560 Tests R1: 3 X 30 mL, R2: 3 X 9 mL Reagent kit consists of three 30-mL containers of NaOH (sodium hydroxide, also known as lye or caustic soda) and three 9-mL containers of picric acid.