 A bone scan is a nuclear imaging test used to help diagnose problems with bones like skeletal pain, infection, tumor or an injury. Pre procedure, you must inform the doctor if you have any history of allergy or asthma or are pregnant. You will need to remove your ornaments, accessories, purse, belt etc. During the procedure, a cannula is inserted and the technician injects the radioactive medicine. The scan is done 3 hours post injection until which you must have plenty of water to flush out the radioactive medicine from the body. The scan takes around 15-20 minutes and reports are issued the same day after a few hours. You must continue to drink plenty of water throughout the day to flush out the remaining medicine and stay away from pregnant women and children for 24 hours.