The doctor will suspect a herniated disc when symptoms are present. The neurologic examination can reveal abnormal reflexes. Often pain can be elicited when the straight leg is raised when lying or sitting. This is referred to as a "positive straight leg raising test." There can be abnormal sensation in the foot or leg.
A variety of blood tests are frequently done to determine if there are signs of inflammation or infection.
Plain film X-rays can indicate "wear and tear" (degeneration) of the spine. They do not, however, demonstrate the status of discs. In order to determine whether or not a disc is herniated, an MRI scan or CT scan is performed for diagnosis.
An electromyogram can be used to document precisely which nerves are being irritated by a disc herniation.
Important: The opinions expressed in WebMD User-generated content areas like communities, reviews, ratings, blogs, or WebMD Answers are solely those of the User, who may or may not have medical or scientific training. These opinions do not represent the opinions of WebMD. User-generated content areas are not reviewed by a WebMD physician or any member of the WebMD editorial staff for accuracy, balance, objectivity, or any other reason except for compliance with our Terms and Conditions. Some of these opinions may contain information about treatments or uses of drug products that have not been approved by the U.S. Food and Drug Administration. WebMD does not endorse any specific product, service, or treatment. Do not consider WebMD User-generated content as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.