Dear ljlynneThe risk of forming a seroma after an abdominoplasty is low, probably in the 1 to 3 percent range in a typical case. Certain factors can increase this risk. Liposuction of the abdominal wall at the time of abdominoplasty as well as abdominoplasty after major weight loss have higher rates of seroma formation.
The chances of developing a serum is small; I think that, at least in my practice, the use of sutures from the abdominal wall to the abdominal wall fascia (progressive tension sutures) along with the appropriate use of drains, has cut down the incidence significantly. I hope this, and the attached link, helps.