With iPhone, you can personalize your Medical ID to keep your important health information in case of emergency.
Tap Medical ID. Then tap Edit to add information such as birthdate, height, weight, and blood type. You can also add emergency contacts.
Turn on Show When Locked to make your Medical ID available from the Lock screen. This lets people helping you in an emergency get important information about you. They'll also be able to contact people you've entered as emergency contacts.
Here's how to access Medical ID when your device is locked: