Figure 1.

Clinical algorithm for sleep studies. (A) The total cost of the third-party approach wherein all patients undergo a home sleep test (HST) as the initial procedure and (B) the costs of the approaches using the three prediction tools were calculated on the basis of the algorithm shown. In (B), patients identified as having an increased risk of having obstructive sleep apnea (OSA) by the prediction tool go on to have an HST as the initial diagnostic procedure whereas those without an increased risk have an in-laboratory polysomnogram (PSG) as the initial diagnostic procedure.