Which one is used by insurances to determine approval for cpap therapy. Learn about the different type of respiratory events how they are scored and what they mean for treatment options and insurance coverage of cpap therapy. Pink Collar Progression Pink Women Fashion So needless to say he would be at the severe stage of sleep apnea. Sleep apnea rdi index . However there s another index for measuring sleep disorders that will now. So that s all about ahi. Rdi if young thin patient who is less likely to desaturate by 4 with events. This is less commonly discussed among sleep apnea patients because ahi is such a clear metric for understanding their disorder s severity. Based on the ahi the severity of osa is classified as follows. Like the apnea hypopnea index ahi it reports on respiratory events during sleep but unlike the ahi it also includes respiratory effort related arousals reras. These events do not fall under the definition of apnea and hypopnea but still ca...