Care of a PerCutaneous Nephrostomy (PCN) Tube Download PDF, 1.1MB, PDF What is a PerCutaneous Nephrostomy Tube?A PerCutaneous Nephrostomy (PCN) tube is a small tube that is inserted into your kidney to drain urine out of the body.The tube is placed at the back of your body, at either the left or right.Read on to find out how to care for your PCN tube. [Please download the PDF file if you are unable to view the image below.]