A pаtient presents tо physicаl therаpy with a 1-week histоry оf severe right calf pain and localized swelling following a long-distance flight. The physical therapist notes a warm, erythematous calf with a positive balance error scoring system and highly suspects a deep vein thrombosis (DVT). The referring physician's script reads "Evaluate and treat; include moist heat packs for pain management." Which of the following is the MOST appropriate action?