What it confirms
After your examination, the doctor completes and issues an original certificate of medical examination. It confirms that medical surveillance required under CAR 2012 was carried out, and the date it happened. That's it.
Who receives it
You receive a copy, and so does your employer (both if you're employed; you keep the only copy if you're self-employed, since CAR treats you as both).
How long it needs to be kept
Your employer should keep the certificate, or a copy, for at least 4 years from the date it was issued. This sits alongside a separate health record, which your employer must maintain for at least 40 years, covering your asbestos work history and the dates of your examinations, without confidential clinical detail.
Non-licensed (NNLW) certificates
For non-licensed work, the certificate works the same way in principle: it confirms the examination took place and the date, issued by whichever doctor, HSE-appointed or GMC-registered, carried out your NNLW medical.