Apnea Hypopnea Index

Apnea Hypopnea Index (AHI)

AHI (Apnea Hypopnea Index) is the number of apneas and hypopneas per hour. 5-20 mild, 21-50 moderate, above 50 severe

To determine AHI add the total number of Apnea events, plus Hypopnea events and divide by the total number of minutes of actual sleep time, then multiplied by 60.

Example

Apnea + Hypopnea divided by actual sleep time, then multiply by 60

200 Apnea 200 Hypopnea

400 Total Events

420 Actual Sleep time (7 hours)

Divide 400 by 420 =.95 x 60 = 57 AHI (Severe OSA)