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. Author manuscript; available in PMC: 2013 Feb 7.
Published in final edited form as: Pediatr Crit Care Med. 2011 Sep;12(5):525–531. doi: 10.1097/PCC.0b013e3181fe4474

Figure 1. Free cortisol per centrifugal ultrafiltration (CUF) plasma fractionation as a function of free cortisol per equilibrium dialysis (EQD) plasma fractionation.

Figure 1

Figure 1

Figure 1

Figure 1

A comparison of the CUF versus EQD techniques is displayed for the entire population (n = 164) in the upper graphs and for the population of children with a free cortisol level < 2 ug/dL (n=94) in the lower graphs. Cortisol concentrations in ug/dL. CUF FC, centrifugal ultrafiltration free cortisol; EQD FC, equilibrium dialysis free cortisol. As displayed in Figure 2, the relationship between FC and TC was quadratic. These graphs demonstrate the non-linear binding characteristics between cortisol and its binding proteins (17).