Alternative NamesUAC; UVCInformationA catheter is a long, soft, hollow tube. Catheters vary in size. An umbilical catheter is used for different reasons.An umbilical artery catheter (UAC) allows blood to be taken from an infant at different times, without repeated needle sticks. It can be used to continuously monitor your baby's blood pressure, too. This type of catheter is most often used if your baby needs breathing help or very strong medicines to treat blood pressure problems.An umbilical venous catheter (UVC) allows fluids and medications to be given without having to frequently replace an intravenous (IV) line. This type of catheter may be used if your baby is very premature, has bowel problems that prevent feeding, or needs very strong medicines to treat blood pressure problems.HOW