The ethanol test, commonly known as alcohol test, is used for both medical and legal purposes. Samples and results for each use are usually collected and tested separately. medical testing is used to determine the level of ethanol in the blood in order to effectively treat the intoxicated person's symptoms. Blood is the most common sample used for medical alcohol tests. The tests may be ordered for a person who presents to the emergency room with signs and symptoms suggesting ethanol toxicity. Other tests, such as a complete blood count (CBC), glucose, and electrolyte measurement, are often ordered at the same time because there are a variety of other conditions that can cause symptoms similar to ethanol intoxication. Overdose testing, drugs of abuse testing, and testing for the presence of other toxic alcohols such as methanol and isopropyl alcohol may also be performed if a person is suspected of ingesting or using other substances. Legal (Forensic): legal testing is used to identify the presence of alcohol and to evaluate its presence in the context of a variety of different laws. Post-mortem ethanol testing may be done to determine whether alcohol contributed to a person's death. Legal ethanol testing may also be performed randomly as part of an employer's drug testing program or it may be performed "with cause" as part of an investigation after an on-the-job accident has occurred. It may also be done as part of an application for life insurance.