Indications Administration of IV fluids and drugs Repetitive venous blood sampling Contraindications Absolute contraindications None Relative contraindications Planned use of very concentrated or irritating IV fluids: Use a central venous catheter or intraosseous infusion Infection or burned skin at a prospective cannulation site Injured or massively edematous extremity Thrombotic or phlebitic vein Arteriovenous graft or fistula Ipsilateral mastectomy or lymph node dissection In the above situations, use another site (eg, the opposite arm).