Acetaminophen, also known as paracetamol, is a drug commonly used for relieving pain and fever. It is an over-the-counter medicine used with recommended doses. The intake of acetaminophen in large amounts can cause serious damage to the liver. The acetaminophen test is conducted to test the level of the drug present in the blood. The test evaluates a drug overdose and diagnoses the risk of suffering a liver failure. Along with the acetaminophen test, the doctor can suggest you go through a few other tests like liver enzyme test to evaluate the composition and effects of the drug properly.