In general, the normal size of an aortic root is 2.0-3.7 centimeters; however, the measurement should be corrected for a patient's body surface area, notes Echocardiographer.org. The aortic root is the portion of the aorta that is closest to and connects to the heart, notes the University of Wisconsin. It helps the aorta carry blood from the heart to the rest of the body.
It is important to note the normal size of the aortic root in patients to ensure that it is not becoming enlarged. An enlarged aortic root is called an aneurysm. When this occurs, it can also cause the aorta to dilate and the aortic valve to leak. If the aortic root aneurysm ruptures, it can cause internal bleeding that is life-threatening, notes the University of Wisconsin.