I'm scheduled for BA and lift. Will 700cc implants give me a 38DD size?

Thank you for the question. There is no accurate correlation between size of breast implant and cup size achieved. I ask my patients not to communicate their goals or evaluate the outcome after breast augmentation surgery, in terms of achieving specific cup size.  Cup sizes may vary from one bra manufacturer to another and are not at all a reliable “measure” of breast size.  Generally speaking, the best online advice I can give to ladies who are considering  breast augmentation/lifting surgery ( regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as  “natural” or "DD cup”  etc means different things to different people and therefore prove unhelpful.
 The use of computer imaging technology may also be very helpful during this communication process.
3.  Once you feel you have communicated your goals clearly,  allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery.
 Best wishes; hopefully you will be pleased with the long-term outcome of the procedure performed, regardless of the specific cup size achieved.

It is difficult to answer your question specifically without assessing your exact measurements of height, weight, frame, breast diameter, skin quality, degree of sagging, thickness of breast tissue, etc. That being said, a 700 cc implant is considered very large for almost any augmentation patient. I suggest you discuss this further with your plastic surgeon. You might get some helpful information by trying on sizers that your plastic surgeon may have in the office. In general, the larger your implant, the greater the chance you might need some revision surgery at some future point due to gravitational effects and stretching. If you need a breast lift, a smaller implant can generally achieve the look you seeking. Best of luck.