If the patient is immobilzed, perhaps an in-home overnight oximetry on room air would suffice for the recert. The interpretation can be read by the physician, regardless of an office visit. If the patient qualifies the order would be for hours of sleep, but since the patient doesn't get out, the stationary concentrator would supply the 02 needs. Another option would be a home visit by a nurse practitioner (who has prescriptive rights.)
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