The most common hazards of bone scan are as follows: 1, bone scan requires exposure to radiation, there is a certain amount of radiation; 2, the contrast agent has a certain risk of allergy, before the injection will generally be skin test; 3, the urine of patients receiving bone scan has a certain amount of radiation, you need to let the doctor handle the urine, so drink a lot of water after the examination, can promote the elimination of the contrast agent. Bone scan, also known as bone imaging, is the injection of radioactive drug bone imaging agent into the blood vessels, and the bone imaging agent is divided in the bones of the whole body under the action of blood circulation, and then the whole body bone radiography is performed to determine the disease, such as whether there is tumor metastasis, through the concentration of the imaging agent in different parts is different. The half-life of 99mTc-MDP is 6.5 hours, so it is quickly excreted in the human body and is generally not harmful.