How far above your BWD can you choose your breast implant?

All women have some degree of asymmetry to the breast. In some cases the asymmetry is so minimal, that it doesn't cause visible asymmetry. In other cases, asymmetry is noticeable and may even be one of the contributing factors for women seeking breast enhancement.
Visible asymmetry can either be corrected by using two different sizes of implants, or by combining breast implants with fat transfer if the goal is to make both breasts larger. In cases where two different sizes of implants are used, your surgeon may either choose to use two different diameter implants or two different profiles of implants. All surgeons have different rules when it comes to maximal implant width for any given base width diameter. Many like to stay within 0.5 cm of the base width diameter, unless you are correcting a narrow breast width (like in cases of tuberous breast).

After I measure and discuss goals with my patients, we then look at pictures of women (my patients) with similar measurements with different size and style breast implants, and they choose what looks right for them. They also get to see what they would look like when the breasts have fully dropped and fluffed and in clothes. You get to see actual results and the surgeon's experience and not a virtual idea of what can be achieved. Women tell me that this process is very helpful in determining what size and style breast implant is right for them. Dr. Ted Eisenberg, Board Certified Plastic Surgeon and Author. RealSelf Distinguished Hall of Fame Inductee. Philadelphia, Pa., USA

Breast width is one of the guidelines surgeons use in helping to select implants to recommend. There are other considerations however. Your board certified plastic surgeon is your personal expert who will consider your anatomy as well as your goals. That information will be combined with your surgeon's experience to help you select the right implant.