Your health care professional can diagnose a deviated septum during the physical examination. Usually, bright light and an instrument that can help visualize the nasal septum by opening the nostril (nasal speculum) will help make the correct diagnosis.
Well, in order to treat a deviated septum, only medical treatment is an advanced surgical procedure. The best possible surgical procedure for treating a deviated septum and sleep apnea takes anywhere between 30-90 minutes to complete. However, it depends on the complexity of the condition as well. Any hindrance such as extra pieces of cartilage or bone is removed in the procedure to straighten the septum.