Many ER patients arrive at the hospital without anyway for medical staff to know who they are or how to reach their emergency contact. The iPhone solves this problem with their “Medical ID” feature. When an emergency worker finds your phone, they can see your name, date of birth, medical conditions, blood type, and emergency contact, even when your phone is locked by pressing the “Emergency” button on the keypad. You can set up the Medical ID in the “Health” app that comes installed on your phone. Look for the icon with the little heart:
Once inside the Health app, you will see the dashboard, which features statistics on your activity throughout the day. Look toward the bottom right, and you will see the Medical ID section. Tap that.

In the top right, press Edit so that you can enter in your health information:

You have the option to enter your name; your birthday; any medical conditions, notes, allergies, or medications; an emergency contact; your blood type; organ donor status; plus height and weight.
Be sure to keep the “Show When Locked” toggled to green. Click “Done” when finished.
Now that you have entered in your information, you can see what an emergency worker will see if your phone is locked. Lock your phone and then unlock it again to be brought to the screen where you enter your passcode. Press “Emergency.”
This will bring up the “Emergency call” screen. Note Medical ID in the bottom left corner.
When you press it, all the information you entered will be displayed. Your loved ones and hospital staff will thank you.