What is the normal graft flow volume range?

• A. 300-1000
• B. 100-3000
• C. 50-150
• D. 2000-4000

Answer: (A)

Graft flow volume measures how much blood passes through a vascular graft each minute, typically assessed with duplex ultrasound by combining velocity data with the vessel’s cross‑sectional area. This value helps determine whether the graft is patent and functioning well for its purpose (for example, in dialysis access).

The range of 300–1000 mL/min is used as a practical normal window in many practice standards because it represents a level of flow that is usually sufficient for clinical needs without showing signs of excessive or insufficient flow. If the flow falls well below this range, there’s a higher likelihood of significant downstream stenosis or other narrowing impairing patency. Conversely, flows approaching or exceeding the upper end can indicate high‑flow states or problems needing further evaluation. The key idea is that a functioning graft tends to produce a moderate, steady flow in this interval, whereas abnormal grafts show deviations outside it.