The forearm loop graft is frequently chosen when there is no forearm fistula option, and when a fistula in the upper arm is not expected to mature quickly. The forearm loop can be used within weeks, and because it drains to the cephalic and basilic veins in the upper arm (which then grow) it can lead to an upper arm fistula in the future. The forearm loop ordinarily should not be done where there are suitable vessels for a forearm fistula.