You do not have to pre-authorise your Advanced Diagnostic tests with us in advance, but we will require a referral letter from your doctor, (or from your specialist if it is a PET scan), before we can assess your claim. If you would like us to confirm cover prior to undergoing the scan or you would like us to try to place a guarantee of payment directly with the medical facility, we will need at least 48 hours notice prior to the scan to enable us to obtain the information we need to assess whether the scan is covered. Please contact us as soon as you know you need to have a scan. You can find our contact details here