Right heart catheterization is a medical procedure used to measure pressures in the right side of the heart and the lungs. A thin, flexible tube called a catheter is inserted through a vein, usually in the neck or groin, and guided to the heart. This allows doctors to assess conditions like pulmonary hypertension or heart failure. During the procedure, various measurements are taken, including the pressure in the right atrium, right ventricle, and pulmonary artery. The information gathered helps healthcare providers diagnose heart conditions and determine the best treatment options for patients.