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The page below is a sample from the LabCE course Proficiency Test Handling and Communication. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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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 cross over testing between the sample types?

Please select the single best answer