Which tests typically require a chain of custody?

A chain of custody is a process that ensures the integrity and traceability of a sample from the moment it is collected to the time the results are reported. This is especially critical for tests that could have legal implications, such as drug and alcohol testing.

In the case of drug and alcohol testing, maintaining a strict chain of custody helps to prevent tampering or contamination of the samples, thus ensuring that the results are valid and can be used in legal proceedings if necessary. Each individual who handles the sample must document their involvement, including timestamps and signatures, to create a documented history that shows the sample has been securely handled.

In contrast, complete blood count tests, cholesterol level tests, and routine glucose testing do not typically require such rigorous protocols. These tests are usually performed for medical reasons and are not intended for legal situations where the chain of custody would be critically important. Therefore, the necessity for a chain of custody is most relevant in the context of drug and alcohol testing.