Adult: 8 AM–10 AM: 5–23 ng/dL; SI units: 138–635 mmol/L.
4 PM–6 PM: 3–13 ng/dL; SI units: 83–359 mmol/L
Chlid: 8 AM–10 AM: 15–25 ng/dL
4 PM–6 PM: 5–10 ng/dL
. Green-top tube.
■ Powerful glucocorticoid secreted by the adrenal cortex in
response to ACTH. Higher in the morning.
■ Affects gluconeogenesis, fat and protein metabolism; aids
in regulation of immune system; is increased during
physical or emotional stress.
■ Assessed in the evaluation of Cushing’s syndrome and
Addison’s disease.
