Catheter having dedicated blood collection port and related methods

A catheter assembly, comprising:

• a catheter adapter having a distal end comprising an intravenous catheter, a proximal end configured to receive a needle assembly, and an interior lumen extending therebetween;
• and
• a first lumen and a second lumen;
• an extension tube, wherein the first lumen and the second lumen extend through the extension tube, the first lumen and the second lumen being in fluid communication with the interior lumen at a first end of the extension tube;
• a y-port comprising:
• an infusion port, wherein the first lumen extends through the infusion port;
• and
• a blood collection port, wherein the second lumen extends through the blood collection port, wherein the first lumen extends between the catheter adapter and the infusion port, wherein the second lumen extends between the catheter adapter and the blood collection port, wherein the first lumen and the second lumen extend through the y-port as mutually isolated fluid pathways such that the first lumen and the second lumen are entirely fluidically separated from each other within the y-port.