Systems and methods for phlebotomy through a peripheral IV catheter

An apparatus, comprising:

• an introducer defining an inner volume, the introducer having a distal end portion configured to be coupled to an indwelling peripheral intravenous line;
• a catheter having a proximal end portion and a distal end portion, the catheter defining a lumen extending through the proximal end portion and the distal end portion of the catheter, the catheter configured to move between a first position, in which the catheter is disposed within the introducer, and a second position, in which at least the distal end portion of the catheter is distal to the introducer;
• and
• a guide member coupled to the introducer, the guide member defining a lumen configured to receive and guide a portion of the catheter, wherein a portion of the catheter is received within the lumen of the guide member when the catheter is in the first position, and wherein the distal end portion of the catheter is distal to the guide member when the catheter is in the second position.