document updated 11 years ago, on Jul 18, 2012
There are various ways of referring to a patient's medical history, and including some of the data on part of their body, in case of an accident.
medical ID tag
[wikipedia]
medical tattoos
[wikipedia]
online information
Rather than trying to store all possible data on the patient, you can store the data on a website, and reference the website + patient-ID on someone's body instead. Companies that perform this service: