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Analytical Bias Exceeds Desirable Quality Goals in 4 of 5 common Immunoassays

Bias exists! And in a recent Clinical Chemistry study, the authors found unacceptably large biases in 4 out of 5 common immunoassays: cobalamin, folate, ferritin, TSH, and Free T4.  Does a Sigma-metric analysis agree with this judgment?

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