The Cholinesterase Serum test measures the levels of cholinesterase enzymes (specifically acetylcholinesterase and butyrylcholinesterase) in the blood. These enzymes are involved in the breakdown of acetylcholine, a neurotransmitter important for nerve function. This test is used to assess liver function, diagnose pesticide poisoning (especially organophosphate exposure), and monitor certain types of poisoning or nerve disorders. Low levels of cholinesterase can indicate liver disease, pesticide exposure, or other health conditions that affect the nervous system or liver.