The study design is a randomized non-blinded clinical trial of extravasation rates of US guided peripheral vascular access related to intravenous catheter length and venous depth in the ED. Primary endpoint is duration of usable vascular access. Secondary endpoints are catheter length, venous depth, time of procedure, successful cannulation, reasons for failure, number of skin punctures, site of cannulation, sonographic technique, type of provider obtaining access and complications.