I am planning to have a BA. If my MCV and MCH are high can the surgery be done?

Thanks for this question. It's a pleasure to answer this for you! First of all, these labs values by themselves will not keep you from having your operation as long as your no anemic. Second, you can consider taking vitamin B6 and B12 and see if your values improve in 3 months. You'll need to do some research on different implant options so see the links below!
Best wishes, Dr. ALDO 

More information is needed to give a safe and satisfactory answer. Your surgeon will review all of your tests and general health and then determine if further testing is needed or if you will be good to go.Dr. Ted Eisenberg, Board Certified Plastic Surgeon and Author 

Your high MCV and MCH will be evaluated in context of your other blood results and other medical information. In of itself, these scores should not preclude surgery. Your surgeon should take all proper precautions including speaking with your primary physician/internist to get more detailed medical history.