What is the normal size of aortic valve, mine is 1.7 cm descending i'm a small 27 year old female. weigh 125 and height is 5'4. is this normal?

Aortic valve: In general they classify area of 1.5-2.0 as mild aortic stenosis ... Obvously body size is in direct correlation with the aortic valve size ... Your size maybe on the smaller end but does not necessarily translate into being clinically significant .. I would suggest you discuss with your cardiologist who performed your echo.

Valve, Root, Aorta?: Depends on where. Valve is rarely measured & when estimated, as an area in cm2, not a diameter. A common aortic outflow track diameter, below the aortic valve, is ~2.0 cm (commonly used as basis to estimate aortic valve area). Aorta above valve usually larger, ~3.0 cm, prior to takeoff of brachial & carotid arteries, then ↓es in size & descending aorta, posterior to heart, commonly ~2 cm diameter.