title: Duplex examination.
abstract: BACKGROUND
  Accurate venous diagnosis remains a challenge for the phlebologist and vascular laboratory. In recent years duplex ultrasound has become the preferred method of diagnosis for deep venous thrombosis and deep and superficial venous insufficiency.
  
  
  OBJECTIVE
  To describe the physical principles, typical protocol, and indications for venous duplex examination.
  
  
  CONCLUSIONS
  Duplex examination offers a precise, noninvasive technique to make anatomic and functional venous diagnoses.
authors.forename: P K
authors.initials: PK
authors.lastname: Thibault
mesh_terms: D006801:Humans; D007866:Leg / Q000098:blood supply*; D013924:Thrombophlebitis / Q000000981:diagnostic imaging; D018616:Ultrasonography, Doppler, Duplex / Q000295:instrumentation / Q000379:methods; D014680:Veins / Q000000981:diagnostic imaging*; D014689:Venous Insufficiency / Q000000981:diagnostic imaging