After device implant, a clinical assessment was completed to determine eligibility for filter conversion. This assessment was done at an interval post-implant and frequency per the investigator's discretion, often with input from the primary care physician. If the clinician determined the subject was no longer at risk for pulmonary embolism, there was no thrombus in or below the filter, and there was no clinically significant deep vein thrombosis (DVT) in the legs, the filter could be converted. After conversion, subjects were followed at 30 days and 3-months by telephone, and at a 6-months post-conversion office visit with imaging (KUB or spot film and Doppler or CT).