I see the INS has a standard that discourages lab sampling from a "peripheral line" except at insertion time. I do not see anything specifically related to midlines. My lab tells me they can find no reason to prohibit drawing from a midline. I have heard and just accepted that we generally don't draw from midlines but I question why. I find no science. Can someone show me the sceince? I am updating policies and need to know what other data prevents lab draws from midlines.