A Home Sleep Apnea Test (HSAT) or In-Lab Sleep Study (also known as a PSG) can test for sleep apnea and measure how well you sleep. These tests can help your doctor find out whether you have a sleep disorder and how severe it is. Sleep studies are the most accurate tests for diagnosing sleep apnea. A HSAT can be scheduled free of charge through RHS in Alberta or British Columbia. In-Lab Sleep Tests are available to be scheduled in Ontario, Alberta and BC.