Stacey,
As long as your liver iron levels are good, I don't think there should be any concern over serum ferritin levels. The iron in serum ferritin does not cause any harm to the body, unlike the iron in organs. The ferriscan is a much better indicator of how well your chelation is working than the ferritin test. As long as you don't show any new buildup of iron in your liver, I think you can relax.