The "two-week rule" is an expedited clinical referral guideline implemented within public healthcare systems like the UK National Health Service to ensure rapid specialist evaluation for patients presenting with suspected cancer symptoms. Under this protocol, general practitioners are mandated to refer a patient so that they receive an urgent, face-to-face specialist consultation with a urologist or oncologist within a maximum timeframe of two weeks if diagnostic indicators—such as highly abnormal prostate-specific antigen blood test results or suspicious clinical examinations—strongly suggest the potential presence of prostate cancer.