An apparatus and method for performing warming therapy is described. In one exemplary embodiment, the apparatus includes a patient support assembly and at least one heating element coupled to the patient support assembly, formed of a plurality of heating cells. In another exemplary embodiment, the heating element is formed of a plurality of separate heating segments which may be Individually controlled. In yet another exemplary embodiment, the heating element is coupled to at least one oxygen sensor and a control system for controlling the power applied to the heating element based on the oxygen level measured by the oxygen sensor. The heating element may be made of materials which are X-ray transparent, so that a patient disposed on a heated mattress will not need to be moved from the mattress to have effective X-ray diagnostics performed.
