A discogram, also spelled diskogram, is a test used to evaluate back pain. A discogram might help your doctor determine if a disc disorder in your spine is a cause of your back pain. Spinal discs are sponge like cushions between the bones (vertebrae) of the spine. During a discogram, dye is injected into the soft center of one or more discs. The injection may reproduce your back pain. The dye also moves into any cracks in the disk’s exterior, which can then be seen on an x-ray or CT scan. However discs that show signs of wear and tear don’t always cause symptoms.