1. Supplemental Figure. Passing & Bablok regression graphs for each 25(OH)D assay compared with ID-XLC-MS/MS in each clinical subject group. R is shown in the figures. To convert 25(OH)D concentrations to ng/mL, multiply by 0.4

2. Healthy individuals R = 0.97 R = 0.93 R = 0.94 R = 0.92 R = 0.97

3. Pregnant women
R = 0.91
R = 0.92
R = 0.88
R = 0.92
R = 0.92
R = 0.96

4. Hemodialysis patients
R = 0.92
R = 0.93
R = 0.86
R = 0.93
R = 0.97
R = 0.84

5. Intensive care patients
Intensive care patients not determined with iSYS
R = 0.91
R = 0.82