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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

Table 4.

Total cortisol, free cortisol, and free cortisol as percent of total cortisol concentrations among 21 healthy, non-stressed adults assessed with paired serum samples obtained at ~0800 and ~1600 utilizing temperature-controlled centrifugal ultrafiltration and chemiluminescence immunoassay methodology. All concentrations are expressed as ug/dL. S.D., standard deviation; n = 21.

0800 Blood Sample 1600 Blood Sample
Measure Total
Cortisol		 Free
Cortisol		 Free as %
of Total		 Total
cortisol		 Free
Cortisol		 Free as %
of Total
Mean ± S.D. 10.5 ± 5.1 1.0 ± 0.4 9.9 ± 2.6 6.6 ± 2.7 0.6 ± 0.2 9.6 ± 2.7
Median 9.0 0.9 10.0 6.0 0.6 9.7
Min, Max 5.0, 27.8 0.6, 2.1 4.6, 15.0 2.3, 9.9 0.3, 1.1 4.5, 16.7