Discography is an imaging test. It involves injecting a contrast material into a disc in the spine and taking an x-ray. An x-ray is a test that uses radiation to take a picture of structures inside the body. The contrast material helps the disc appear more clearly on the x-ray.

Herniated Lumbar Disc
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This test is used to detect if a herniated disc or otherwise abnormal disc is a source of pain. Discs are small, circular cushions between the vertebrae (bones) in the spine. A herniated disc occurs when a disc in the spine bulges from its proper place. Herniated discs can press on the nerves and cause severe pain. In some cases, they can cause pain themselves, but often an abnormal disc is not painful.