* Note for pathologists and radiologists: there may be times when uncertainty about a diagnosis can only be resolved by investigations which were not specifically ordered as part of the original request for testing. If these investigations appear to fall outside the scope of the original consent given by the patient, or there are particular sensitivities around the condition for which the pathologist or radiologist wishes to test, they must contact the treating doctor and establish whether further discussion with, and consent from, the patient is necessary before proceeding.