What is defined as a medical alert?

A medical alert is specifically defined as a bracelet, necklace, or card that specifies medical conditions. These items are designed to provide critical information about a person’s medical conditions or allergies, ensuring that medical professionals can quickly access important health information in emergencies. This can be crucial for providing appropriate care, especially if the individual is unable to communicate their needs due to a medical crisis.

The other choices do not capture the essence of a medical alert. While a document stating a person's medical history is useful, it is not readily visible in emergencies like a bracelet or necklace. An emergency contact list serves a different purpose by providing contacts rather than medical information, and a hospital ID badge is for identification purposes rather than for immediate medical alerts. Therefore, the option that accurately describes the function and importance of a medical alert is that it’s something worn or carried that communicates essential health-related information.