Dear jlewis2145,Not every transitioning patient uses hormones so it is not a pre-requisite before having surgery. If you intend on starting hormones in the future, you may want to hold off on picking implant sizes until you see what your body can do naturally. If you anticipate needing the kind of size jump only obtainable with implants, you could discuss moving forward with your surgeon before the hormones.You should google and read "Standards of Care for the Health of Transexual, Transgender, and Gender-Nonconforming People, Version 7" or WPATH-SOC. This may be very helpful to you and your care providers in deciding the best time for your surgery.Best of luck!