Great question! The fact is that 2000cc of tunescent fluid may be injected, but what is removed can be mostly fluid, mostly fat, or anything in between.
Typically, surgeons will wait for just a bit after injecting the tumescent fluid into your fatty tissues, in order to allow it to diffuse and equalize distribution within and around the fat globules, as well as to compress and vasoconstrict the blood vessels within the fat. This tumescent fluid is particularly important in not only reducing bleeding and bruising, but also post-op swelling and scar fibrosis. For ultrasonic liposuction is also provides a fluid interface between the ultrasonic cannula tip and the actual fat cells, allowing them to be burst by the 26500Hz (or higher) ultrasonic energy. The best analogy for this is the ultrasonic jelly that allows the ultrasound transducer to effectively transmit the sound waves into the abdomen of a pregnant mother, for example!
Much of the fluid is absorbed before the liposuction is completed, and the time before it is started, as well as the time it takes to complete any given area, all have an impact on the amount of fluid in the actual aspirate. Every surgeon is different, but in my practice, most of the aspirate is fat, but that varies by patient, area of liposuction, redo or primary, and amount of fat to be removed in the first place.
Tumescent fluid is not needed for laser liposuction, but may actually act in a protective fashion (heat sink for excessive thermal energy that could "burn" the underside of the skin) as the cannula does its work.
Bottom line here: Fluid is indeed present in the aspirate, but with effective liposuction in appropriate patient candidates and good surgery, the vast majority of the aspirate is fat--often 90% or more. Some surgeons even record the actual fat percentage in the aspirate, since the fat does indeed float and can be accurately measured after it settles out in the canister.
The real measure of quality surgery, however, is not the volume, or amount, or weight of fat removed (or the presence of fluid), it is the appearance of the patient's contours after healing is complete.
Any idiot with a hammer and chisel can leave marble chips on the floor, but "what is left behind" is not usually a Michelangelo sculpture, even if "laser hammers and power chisels" are used. The sculptor is the critical factor, not the tools utilized, nor what is left on the floor of the studio! The same is true for liposuction. Best wishes! Dr. Tholen