The special chemistry department tests interstitial fluid for protein. The proficiency testing manufacturer provides samples for serum but not for this specific body fluid. What is the most likely reason for the lack of crossover testing between the sample types?

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The special chemistry department tests interstitial fluid for protein. The proficiency testing manufacturer provides samples for serum but not for this specific body fluid. What is the most likely reason for the lack of crossover testing between the sample types?

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