Which value is a standard threshold used for venous lumen diameter in an access graft?

Which value is a standard threshold used for venous lumen diameter in an access graft?

• A. Greater than or equal to 4 mm
• B. Greater than or equal to 2.5 mm
• C. Greater than or equal to 2 mm
• D. Greater than or equal to 6 mm

Answer: (B)

In ultrasound assessment of dialysis access grafts, a practical minimum venous lumen diameter is used to gauge patency and suitability for cannulation. A value of 2.5 mm is a common lower limit; if the venous lumen meets or exceeds this size, the segment is generally considered capable of supporting dialysis flow and cannulation, though other factors like flow rate and velocity also matter. Diameters smaller than this raise concern for stenosis or impending graft failure and typically lead to further evaluation.

In ultrasound assessment of dialysis access grafts, a practical minimum venous lumen diameter is used to gauge patency and suitability for cannulation. A value of 2.5 mm is a common lower limit; if the venous lumen meets or exceeds this size, the segment is generally considered capable of supporting dialysis flow and cannulation, though other factors like flow rate and velocity also matter. Diameters smaller than this raise concern for stenosis or impending graft failure and typically lead to further evaluation.