 A PSMA-PET CT scan is used to detect prostate cancer. Before the scan, a 2-hour fast is recommended. Please carry your medical reports along and inform the attending nurse or physician of any history of contrast allergy. During the scan, a small dose of radioactive injection is given intravenously and the whole body scan is done one hour later. The initial part of the scan is a diagnostic CT wherein intravenous contrast is given, followed by PET imaging. A blood test, serum creatinine, is mandatory prior to the scan if the doctor has advised for a contrast CT. The test reports should not be more than two months old. The scan takes about 10 minutes. Please stay away from pregnant women for a day after the scan. Reports will be issued the next day.