So long as you are otherwise healthy and you don't have a history of excessive bleeding there is no reason to not proceed. I have done a number of patients with this over the last 27years without incident. Typically, the blood loss in abdominoplasty is quite small anyway.
We always require a medical clearance from a primary care doctor before surgery. It would also be appropriate in your case to have clearance from a hematologist prior to proceeding. if you are a thalassemia trait carrier it should not be a problem but it depends on how much tissue is being removed and other factors. All of these concerns should be addressed before surgery!