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Various types of jewellery are available which carry details of your medical condition(s) or give a contact where these details can be obtained. Typically these items are worn near the pulse points on neck or wrist where they are easily noticed by ambulance crews.
These are available from various sources. Ask your doctor or nurse, or have a look at these sites. (These are included for information, we do not endorse any particular type of jewellery)
Medic Alert (registered charity)