Sigma Metric Analysis
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?