We limit our IV attempts to two per RN. Usually only two nurses make an attempt. After that we ask someone from the PICU, transport team, or the ER. If the patient is a newborn or infant and we have difficulty, we also ask assistance from our NICU staff. Our policy states that IV sites are to be changed every 3 days unless it has to be changed sooner (ie. infiltration, falls out, etc.) or if the patient is a known 'difficult IV access' the line can stay in longer as long as it's closely observed as per policy. We also change our tubing every 72 hours, except for HAL/IL tubing which is changed every 24 hours. Hope this helps.