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laboratories measure serum total cortisol concentrations and do not differentiate between the bound and free forms. Cortisol in blood exists in two forms: cortisol that is bound to carrier molecules (cortisol-binding globulin and albumin) and cortisol that is
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Faculty of Life Sciences and Medicine, School of Life Course Sciences, King’s College London, London, UK
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Quebec Heart and Lung Institute, Laval University, Quebec, Canada
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Barts and the London School of Medicine, Centre for Endocrinology, William Harvey Institute, London, UK
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Obesity, Type 2 Diabetes and Immunometabolism Research Group, School of Cardiovascular and Metabolic Medicine & Sciences, Faculty of Life Course Sciences, King’s College London, London, UK
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), adrenocorticotrophic hormone (ACTH), cortisol-binding globulin (CBG), thyroxine-binding globulin (TBG), gonadotrophins, DHEAS, testosterone and plasma EDTA ACTH were collected using BD Vacutainer during the same venepuncture. Samples were stored at −80°C until analysis
Department of Clinical Chemistry and Haematology, Zuyderland Medical Centre, Heerlen, The Netherlands
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cortisol concentrations ( 8 , 9 ). LC–MS/MS analyses are not influenced by changes in e.g. concentrations of cortisol-binding globulin or cross-reactivity with other corticosteroid substances. In addition, LC–MS/MS analysis enables the analysis of cortisol
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Introduction Testosterone is a sex steroid hormone with profound influence on various tissues ( 1 , 2 , 3 ). The precipitous decline in systemic testosterone with age is well described ( 4 ). Additionally, sex hormone-binding globulin (SHBG
Tropical Institute of Reproductive Medicine and Menopause, Cuiabá, Mato Grosso, Brazil
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Healthcare Diagnostics, UK) with a sensitivity of 0.67 nmol/L, coefficients of intra- and inter-assay variation were lower than 12% and 4%, respectively. Serum thyroid stimulating hormone (TSH), estradiol (E2), prolactin (PRL), sex-hormone binding globulin
Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine
Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine
Division of Endocrinology, Division of Nephrology, Endocrine Research Laboratory, Department of Medicine
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as plasma binding protein concentrations and dexamethasone clearance can be significantly altered with decreased renal function (8, 9, 10) . Our reference laboratory often receives inquiries as to whether late-night salivary cortisol can be used to
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, polymerization, regulation and clearance . Biochemical Journal 2016 473 . ( https://doi.org/10.1042/BCJ20160014 ) 7 Hammond GL Smith CL Paterson NA Sibbald WJ . A role for corticosteroid-binding globulin in delivery of cortisol to activated
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cortisol secretion over a 24-h period. It measures the cortisol that is not bound to corticosteroid-binding globulin (CBG), which is filtered by the kidney unchanged. A falsely low UFC can occur when creatinine clearance falls less than 60 mL/min ( 3 ). It
Departments of Endocrinology, Molecular Medicine and Surgery, Metabolism and Diabetes
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differences between groups. Cortisol-binding globulin (CBG) was not measured; however, some studies have shown strong correlations between free (active) and total cortisol, implying no need to correct for CBG (32) . CBG is not affected by age, or the
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5 Purnell JQ Brandon DD Isabelle LM Loriaux DL Samuels MH. Association of 24-hour cortisol production rates, cortisol-binding globulin, and plasma-free cortisol levels with body composition, leptin levels, and aging in adult men