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In page Central sleep apnea:

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A diagnosis of sleep apnea requires determination by a physician. The examination may require a study of an individual in a sleep lab, although the AAST has said a two belt IHT (In Home Test) will replace a PSG (polysomnography) (a sleep study) for diagnosing obstructive apnea[citation needed]. There, the patient will be monitored while at rest, and the periods when breathing ceases will be measured with respect to length and frequency.[1] During a PSG, a person with sleep apnea shows breathing interruptions followed by drops/reductions in blood oxygen and increases in blood carbon dioxide level.