John Kane asked about this. There is a phenomenon whereby serum
calcium, protein and carbon dioxide for a complex and precipitate
(sometimes called CARP, I think for Calcium related precipitate). I
could find no publications on it and I don't know more than what I'm
including here. If some of this precipitate formed, perhaps sampling
picked up more of the precipitate, which may have a higher Ca
concentration. Alternatively, turbidity of the precipitate may have
caused positive interference. A repeat assay on the neat specimen may
pick up less precipitate and calcium. Perhaps the complex dissociates
upon dilution, thus giving the non-linear response. -Jim
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