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I reviewed a case of an AVF exam that had very low Volume Flow Velocities reported (less than 0.06 L/min). The waveforms were obtained approx 5 cm distal to the arterial anastomosis in a straight uniform vein section one month post-op and looked normal in shape. Velocities were not impressively low. Diameter was about 2.2cm. 4 cardiac cycles were included in the calculation. The autotrace of peak velocity and mean velocity tracked the spectral profile without noticeable deviation. The series of beats measured did include a PVC with a low EDV. Also, the degree of fistula maturity may be a factor. I would like to hear others who do a lot of Vol Flow measurements of early dialysis fistulas weigh in here.