What QC validation criteria are permitted for the calibration curve?

What QC validation criteria are permitted for the calibration curve?
The calibration curve must meet the following criteria: a. It should be no older than 30 days b. r² must be > 0.8 c. Not more than 20% of the calibration points are allowed to be bad (red circles) or negative. d. Intercept has defined ranges, which are different for IgE, IgG and IgG4. e. Variation is not considered explicitly for calibration points other than in 2a-e
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As in all diagnostic testing, the diagnosis is made by the physican based on both test results and the patient history.