Fig. 4.
Bland-Altman plots were used to assess the difference (A) and percentage difference (B) between ELSA-PTH and Alinity i Intact PTH. The results consistently showed higher measurements with the Alinity i Intact PTH test method, and as the measured value increased, the disparity between both assays also increased. The percentage difference remained constant irrespective of the measured value. Abbreviations: PTH, parathyroid hormone; SD, standard deviation.