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

Healthy individuals

R = 0.94

R = 0.94

R = 0.97

R = 0.93

R = 0.92

R = 0.97

Pregnant women

R = 0.96

R = 0.88

R = 0.92

R = 0.92

R = 0.92

R = 0.91

Hemodialysis patients

R = 0.84

R = 0.86

R = 0.97

R = 0.93

R = 0.93

R = 0.92

Intensive care patients

Intensive care patients not

determined with iSYS

R = 0.82

R = 0.83R = 0.81

R = 0.91

R = 0.94