CPT® Code 36500

Venous catheterization for selective organ blood sampling is a medical procedure that involves the insertion of a catheter into a specific vein to collect blood samples from particular organs. The choice of vein for catheterization is determined by the organ from which blood is being sampled. Commonly utilized veins for this purpose include the renal veins, which drain blood from the kidneys; the hepatic veins, which carry blood away from the liver; the coronary sinus, which collects blood from the heart; the internal jugular vein, which drains blood from the brain; the left adrenal vein, which drains blood from the adrenal gland; and deep muscular veins, which are located within the muscles. During the procedure, the selected vein is carefully identified, and a catheter is inserted using imaging guidance, which is reported separately. This allows for either the collection of a single blood sample or the placement of the catheter for the purpose of obtaining multiple samples over time, facilitating comprehensive analysis of the organ's blood composition.