Vascular technicians or vascular sonographers operate diagnostic equipment using ultrasound to record vascular information such as vascular blood flow, blood pressure, limb volume changes, oxygen saturation, cerebral circulation, peripheral circulation & abdominal circulation. Registration is offered by Cardiovascular Credentialing International as a Registered Vascular Specialist or by the American Registry of Diagnostic Medical Sonographers as a Registered Vascular Technologist. Basic Requirements: United States Citizenship: Non-citizens may only be appointed when it is not possible to recruit qualified citizens in accordance with VA Policy. Education: There are no specific educational requirements for this occupation. Education may be substituted for experience only at the GS-4 and GS-5