The physical examination marks the beginning of what is called objective data, or data about the patient that is observed, interpreted, and recorded by the physician. This is in contrast to subjective data, which is information provided to the physician by the patient first-hand, and which includes the patient history. After the physical examination, all additional objective data about the patient is provided. This includes the results of any lab tests, imaging studies if applicable, and any other tests specific to the present illness that may have been performed. Common imaging studies include x-rays (XR), computed tomography (CT) scans, and magnetic resonance imaging (MRI) scans of the body region of interest.