Measurement of the time interval beginning with the time results are verified until the critical value is reported by the laboratory for Carbamazepine, Phenobarbital, and Acetaminophen toxicology tests. (Reporting done via phone, or secure electronic transmission, such as text messaging, messaging through Laboratory Information Systems, Electronic Health Records systems, or email with read receipt functionality). When notification is sent by email, performance met is contingent on read receipt received. If a read receipt is not received this should be considered as performance not met.