The aspirate removed during liposuction consists of both fat and fluid. Initially it is mixed together. If the aspirate is allowed to settle, it will separate into a fluid layer on the bottom, and a fat layer on the top. The fluid layer consists mostly of some portion of the wetting solution (saline i.v. fluid, lidocaine, and epinephrine) that was injected, as well as a small amount of blood. The amount of fluid in the aspirate may depend upon how much wetting solution was injected at the beginning of the procedure. The more wetting solution injected, the more fluid will likely be aspirated along with the fat. For me personally, I find that about 10 to15% of the total volume of aspirate is fluid, and the rest is aspirated fat. What ultimately matters is how much fat is removed. If your surgeon has communicated the “total aspirate” as 6 L, then less than 6 L of fat has been removed. You would need to know how much fluid was removed so you could calculate how much fat was in the aspirate. If your surgeon was referring only to “aspirated fat”, then it truly is 6 L. The weight of 6 L of pure fat aspirate, is -- The density of fat is 0.918 gm/cm3 (slightly less than the density of water 1 gr/ cm3) 1 cm3 = 1 cc = 1 mL 6 L fat = 6000 cc fat 6000 cc fat x 0.9 gm/cc = 5400 gr fat 5400 gr fat = 5.4 kg fat 1 kg = 2.20462 pounds 5.4 kg fat x 2.2 pounds/kg = 11.9 pounds Liposuction is a body contouring operation and not a weight loss operation. Although patients always want to know how much fat was removed, and how much that fat weighs, patients do not usually experience large changes in body weight following liposuction. Best wishes.