Based on his experience from performing over 5,000 fat transfer cases, Dr. Karam determines how much fat to add based on how much of a deficiency there is to correct. Each case is unique and the amount of fat chosen is based on the individual patient and on the patient’s goal. Dr. Karam always errs on the side of under-filling as opposed to over-filling. This ensures a natural outcome. In general, most patients retain about 50% of the fat that is injected. In some rare instances, some patients may keep slightly less.