In the 5th left intercostal space
The four valves of the heart can be auscultated at very distinct spaces. The mitral valve can be ausculatated in the left 5th intercostal space, slightly below the nipple.The aortic valve can be ausculatated in the 2nd right intercostal space, just lateral to sternal angle. The pulmonary valve can be auscultated in the 2nd left intercostal space, just lateral to sternal angle. The tricuspid valve can be auscultated in the 4th left intercostal space, just lateral to sternum.