Your doctor will ask you questions about your symptoms and what makes your symptoms more bothersome. Several physical exam tests can be done such as pressing over the elbow to see where you are most tender or asking you to extend your wrist back against resistance.
X-ray: sometimes X-rays of your elbow are done to assess for conditions such as arthritis that may be contributing to your pain
Ultrasound: ultrasound can be used to visualize the tendons at the elbow and assess the health of the tendon. Ultrasound can also be used to guide injections into the appropriate tendon.
MRI: occasionally if the symptoms do not improve with initial treatments, an MRI may be obtained to assess the tendons at the elbow as well as the ligaments and joint itself.