Cholinesterase (ChE) Test Using Ellman’s Photometric Method Kusumo Adi Arji Atmanto1*, Mutmainnah2,3, Ibrahim Abd. Samad2,4 Abstract Cholinesterase (ChE) is a group of enzymes that hydrolyze cholinester. There are two ChE isoenzymes in the blood, namely Acetylcholinesterase (AChE) and Butyrylcholinesterase (BChE). Both ChE isoenzymes are required in the process of sending