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Passing and Bablok regression analyses for the five automated immunoassays in pregnant women and healthy controls. On the x-axis, the fT4 concentrations were measured using LC-MS/MS and, on the y-axis, the fT4 concentrations using the respective immunoassays are shown. (A) Alinity; (B) Atellica; (C) Cobas; (D) Lumipulse; (E) UniCel DXI.
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