A

1
Supplemental Data Fig. 1. Deming regression plots
showing correlation and method adjustment
equations.
A
B
r 0.98
r 0.97
C
D
r 0.99
r 0.99
2
Panel A USDA HPLC serum compared to USDA HPLC
plasma, n 30. Panel B USDA HPLC plasma
compared to CDC HPLC plasma, n 150. Panel C
CDC HPLC compared to Abbott AxSYM, n
361. Panel D Abbott AxSYM compared to Abbott
IMx, n 361.