For eligible participants, a clinical exam of the AV access ("Look, Listen, Feel") per SOC will be done by a qualified site clinician/nurse, followed by an assessment of the AV access using the PatenSee system on a weekly basis for 6 weeks, and then biweekly up to 1 year from enrollment. Additional data regarding imaging and complications of the AV access will be collected. Clinical decisions, such as referrals for further investigation and management of the AV access will be based solely on standard clinical monitoring.