Banerjee referred to the rule of 6s when judging an arteriovenous fistula for functional maturation.
Patient selection: autologous arteriovenous fistula
Rules of 6's:
(1) assessment is done at 6 weeks after created
(2) the diameter of the body of the fistula should be >= 6 mm
(3) depth below skin no more than 6 mm (from 5-6 mm)
(4) blood flow rate >= 600 mL per minute on duplex ultrasound
(5) the length of the fistula should be 5-6 cm
