IV Insert Technique Tip: Avoid Vein Valves if You See Them (Vein Check) When starting an IV on a patient's forearm, you want to be mindful of any visible valves. Granted, most patients will not have a low enough body fat percentage to see valves, but if they do, you can usually spot them by a knotty or bumpy appearance along the veins, as you can in this patient's forearm veins. More IV tips: https://www.youtube.com/watch?v=sCHltpeKLeI&list=PLQrdx7rRsKfXr6kruqEpIovf66sxo0gxh Vein valves