It may be the same with iodine, they just don't know it yet, that excess Iodine is stored in bones or collagen tissue and serum levels for a person who takes a gram a day for 6 months, are the same as the person who only takes 1 milligram per day for 6 months. The Iodine loading test they use, its results, are consistent with this "loading" theory. That they give you iodoral every day and look at your piss and keep doing more iodoral until you excrete 90% of what you are intaking. This, clearly, unequivocally is some kind of loading going on, no question about that. The question is, where is the Iodine being stored ? We already know the answer from the radiograms given of the whole body to persons after being medically treated with I-131 and the answer is "everywhere", skin, stomach, ovary, thyroid, etc. There is no mystery to this, only people who havent' thought much about it.

Still a serum test will only reveal the 2% of the potassium of the body. I said it would be constant, but a better expression would be within range.
Some of the most magnesium deficient (by symptoms) people I knew of, came up normal to high on the serum test. Some of the most hypo thyroid people I knew, came out hyper thyroid upon testing. There is, IMO a question if the tests are valuable enough. For me not; it is so much easier to go by symptoms. But thats me.

Sulfur is something to consider as it increases the permeability of the cell wall itself. Nutrients in, waste out, the sodium / potassium pump. It may be the missing link for some.
//www.curezone.org/forums/fm.asp?i=2012733#i