I would like to know what is best practice re: drawing blood from central lines. We currently use Max Plus end caps. I've heard that drawing blood through the endcaps can cause hemolysis. It's also not very easy to flush all the precipitate out of the Max Plus caps. So I've been instructing staff to remove the caps and draw directly from the hubs, replacing a new cap afterward. Does anyone have any thoughts about this? Has there been any evidence based research out there?