This computerized system will identify hospitalized patients at high risk for VTE and will analyze their records to determine whether they have received thromboprophylaxis orders. If the system identifies any high-risk patient who does not have orders for thromboprophylaxis, then a series of prompts will be issued to the ordering physician. The physician whose patient is at risk for VTE will be requested to institute prophylaxis. If the automated request is not followed, a series of alerts will query reasons for withholding preventive measures. Further prompts will lead to centralized computer-generated ordering of graduated compression stockings, unless the physician opts out and unselects this order. Important elements in the alerts include an up-to-date selection of pharmacological agents, doses based on renal clearance, and the documentation of reasons for withholding prophylaxis by the ordering physician.