Many times with PICC insertion only one arm is available to be used. In these instances what is the amount of time required before a PICC can be reinserted in the arm that formerly had a PICC associated thrombus. Is it necessary to wait 3 months, 1 year, and is a repeat doppler always necessary especially if it has been a length of time. At what length of time would a doppler no longer be necessary? Does anyone have any evidenced-based practice to support a practice?