Diagnosis of sleep apnea begins with a medical history and physical exam. A sleep study, called a polysomnogram, may be recommended. This test measures the following body functions during sleep:
A multiple sleep latency test measures the speed of falling asleep. An arterial blood gas test may also be performed to check levels of carbon dioxide and oxygen. An electroencephalogram, or EEG, may be done to measure the electrical activity of the brain. A cranial CT scan may also be done to look for any deformities, tumors, or masses in the brain.