It was during one of the episodes shot for the Darfur story line that Noah Wyle actually started an IV for a member of the production team who had become overheated and passed out from hyperthermia. When this show first started he was apparently unable to start an IV as his character when he tries multiple times on Frank who came in the emergency room with a gunshot wound to the knee. After years of acting the part he became proficient in it to where he could start a saline IV and help a crew member who was in distress.
This is an Noah Wyle and Mekhi Phifer centric episode