Under the PT’s plan of care, the PTA is to perform total hip…

Under the PT’s plan of care, the PTA is to perform total hip exercises, transfers and gait training.  On the first day of inpatient therapy, the PTA begins to initiate exercises when (s) he notices that the patient’s calf is red and warm to touch consistent with a DVT.   Which one of the following would be the MOST appropriate action for the PTA to take?