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Corticosteroid-Binding Globulin Human ELISA

  • Regulatory status:RUO
  • Type:Sandwich ELISA, Biotin-labelled antibody
  • Other names:Transcortin, CBG, Serpin A6
  • Species:Human
Cat. No. Size Price

RD192234200R 96 wells (1 kit) $652
PubMed Product Details
Technical Data


Kit composition as well as the assay procedure have been changed. Please see the product data sheet (in "Docs") for details.


Sandwich ELISA, Biotin-labelled antibody


Serum, Plasma-EDTA, Plasma-Heparin, Plasma-Citrate

Sample Requirements

5 µl/well


At ambient temperature. Upon receipt, store the product at the temperature recommended below.


Store the complete kit at 2–8°C. Under these conditions, the kit is stable until the expiration date (see label on the box).

Calibration Curve

Calibration Range

1.56–100 ng/ml

Limit of Detection

0.01 ng/ml

Intra-assay (Within-Run)

n = 8; CV = 1.7%

Inter-assay (Run-to-Run)

n = 5; CV = 7.1%

Spiking Recovery


Dilution Linearity



  • bovine Non-detectable
  • cat Non-detectable
  • goat Non-detectable
  • hamster Non-detectable
  • horse Non-detectable
  • dog Not tested
  • monkey Non-detectable
  • mouse Non-detectable
  • pig Non-detectable
  • rabbit Non-detectable
  • rat Non-detectable
  • sheep Non-detectable
  • chicken Not tested
  • human Yes


The kits are CE-IVD certified and intended for professional use.



  • European Union: for in vitro diagnostic use
  • Rest of the world: for research use only!
  • The total assay time is less than 3 hours
  • The kit measures total corticosteroid binding globulin in serum and plasma (EDTA, citrate, heparin)
  • Assay format is 96 wells
  • Quality Controls are human serum based. No animal sera are used
  • Standard is purified native protein based
  • Components of the kit are provided ready to use, concentrated or lyophilized

Research topic

Immune Response, Infection and Inflammation, Steroid hormones


Human corticosteroid binding globulin (CBG, transcortin), also referred to as SerpinA6, belongs to the serpin superfamily. Corticosteroid binding globulin is a 52 kDa secreted α1-glycoprotein consisting of 405 amino acids. Corticosteroid binding globulin is synthesized and secreted by hepatocytes in the liver and is present in glycocorticoid responsive cells. The concentration of corticosteroid binding globulin is regulated by estrogens. CBG is the major transport protein for progestins and glucocorticoids within the blood. Thus CBG regulates their bioavailability and metabolic clearance and protects them from absorption into cells and degradation by chemicals and enzymes. CBG contains a single steroid binding site with high affinity for cortisol and progesterone. About 80–90% of circulating cortisol is bound to CBG. Albumin bound cortisol is reported to represent 14% and free cortisol 6% of total plasma cortisol under basal conditions. The CBG bound cortisol is considered to be biologically inactive, whereas the unbound cortisol constitutes the active form of cortisol. The active fraction of plasma cortisol will thus depend on the concentration of CBG. Defects in the gene encoding CBG are the cause of corticosteroid binding globulin deficiency (CBG deficiency), a rare disorder characterized by reduced CBG production that results in hypo/ hypertension and muscle fatigue. The plasma concentration of CBG shows little or no diurnal variation and no marked differences are observed in adult subjects according to age, sex or menstrual cycle. In umbilical cord blood, however, CBG is present at half of the normal adult level and prepubertal children have higher levels than adults. Plasma CBG levels increase during pregnancy and are decreased in cirrhosis. Estrogen therapy (e.g. oral hormonal contraception) or implantation during pregnancy cause a very marked increase of the CBG concentration. Decreased levels of CBG are observed in women with polycystic ovary syndrome, hypoproteinemia, Cushing´s syndrome or corticoid treatment and some cases of vitamin B12 deficiency. Extremely low levels of CBG have been reported in patients with septic shock. Measurement of corticosteroid binding globulin is important to the interpretation of cortisol levels. The concentration of unbound cortisol, which is biologically active, can be calculated from the concentration of total cortisol and that of CBG on the basis of mass action.

Product References (9)


  • Ciregia F, Baiwir D, Cobraiville G, Dewael T, Mazzucchelli G, Badot V, Di Romana S, Sidiras P, Sokolova T, Durez P, Malaise MG, de Seny D. Glycosylation deficiency of lipopolysaccharide-binding protein and corticosteroid-binding globulin associated with activity and response to treatment for rheumatoid arthritis. J Transl Med. 2020 Jan 6;18(1):8. doi: 10.1186/s12967-019-02188-9. PubMed PMID: 31907043. PubMed CentralPMCID: PMC6945416. See more on PubMed
  • Dichtel LE, Schorr M, Loures de Assis C, Rao EM, Sims JK, Corey KE, Kohli P, Sluss PM, McPhaul MJ, Miller KK. Plasma Free Cortisol in States of Normal and Altered Binding Globulins: Implications for Adrenal Insufficiency Diagnosis. J Clin Endocrinol Metab. 2019 Oct 1;104(10):4827-4836. doi: 10.1210/jc.2019-00022. PubMed PMID: 31009049. PubMed CentralPMCID: PMC6735741. See more on PubMed
  • Bouras M, Roquilly A, Mahé PJ, Cinotti R, Vourc'h M, Perrot B, Bach-Ngohou K, Masson D, Asehnoune K. Cortisol total/CRP ratio for the prediction of hospital-acquired pneumonia and initiation of corticosteroid therapy in traumatic brain-injured patients. Crit Care. 2019 Dec 5;23(1):394. doi: 10.1186/s13054-019-2680-6. PubMed PMID: 31805967. PubMed CentralPMCID: PMC6896691. See more on PubMed
  • O'Connell GC, Walsh KB, Burrage E, Adeoye O, Chantler PD, Barr TL. High-throughput profiling of the circulating proteome suggests sexually dimorphic corticosteroid signaling following ischemic stroke. Physiol Genomics. 2018 Oct 1;50(10):876-883. doi: 10.1152/physiolgenomics.00058.2018. Epub 2018 Jul 20. PubMed PMID: 30029587. PubMed CentralPMCID: PMC6230873. See more on PubMed
  • Gavin KM, Shea KL, Gibbons E, Wolfe P, Schwartz RS, Wierman ME, Kohrt WM. Gonadotropin-releasing hormone agonist in premenopausal women does not alter hypothalamic-pituitary-adrenal axis response to corticotropin-releasing hormone. Am J Physiol Endocrinol Metab. 2018 Aug 1;315(2):E316-E325. doi: 10.1152/ajpendo.00221.2017. Epub 2018 Apr 6. PubMed PMID: 29631362. PubMed CentralPMCID: PMC6139491. See more on PubMed
  • Melin J, Parra-Guillen ZP, Hartung N, Huisinga W, Ross RJ, Whitaker MJ, Kloft C. Predicting Cortisol Exposure from Paediatric Hydrocortisone Formulation Using a Semi-Mechanistic Pharmacokinetic Model Established in Healthy Adults. Clin Pharmacokinet. 2018 Apr;57(4):515-527. doi: 10.1007/s40262-017-0575-8. PubMed PMID: 28762136. See more on PubMed
  • Tana MM, Alao H, Morris N, Bernstein S, Hattenbach J, Rehman RB, Brychta R, Sarkar S, Zhao X, Walter M, Buckley A, Chen K, Rotman Y. Fatigued Patients with Chronic Liver Disease Have Subtle Aberrations of Sleep, Melatonin and Cortisol Circadian Rhythms. Fatigue. 2018;6(1):5-19. doi: 10.1080/21641846.2018.1408539. Epub 2017 Dec 3. PubMed PMID: 30546968. PubMed CentralPMCID: PMC6287634. See more on PubMed
  • Hawley JM, Owen LJ, Lockhart SJ, Monaghan PJ, Armston A, Chadwick CA, Wilshaw H, Freire M, Perry L, Keevil BG. Serum Cortisol: An Up-To-Date Assessment of Routine Assay Performance. Clin Chem. 2016 Sep;62(9):1220-9. doi: 10.1373/clinchem.2016.255034. Epub 2016 Jul 20. PubMed PMID: 27440512. See more on PubMed
  • Wu J, Xie X, Liu Y, He J, Benitez R, Buckanovich RJ, Lubman DM. Identification and confirmation of differentially expressed fucosylated glycoproteins in the serum of ovarian cancer patients using a lectin array and LC-MS/MS. J Proteome Res. 2012 Sep 7;11(9):4541-52. doi: 10.1021/pr300330z. Epub 2012 Aug 6. PubMed PMID: 22827608. See more on PubMed
Summary References (8)

References to Corticosteroid-Binding Globulin

  • Lewis JG, Bagley CJ, Elder PA, Bachmann AW, Torpy DJ. Plasma free cortisol fraction reflects levels of functioning corticosteroid-binding globulin. Clin Chim Acta. 2005 Sep;359 (1-2):189-94
  • Lewis JG, Elder PA. Alternative ELISA for sex hormone-binding globulin in plasma. Clin Chem. 1998 Sep;44 (9):1999
  • Lewis JG, Florkowski CM, Elder PA, Hunt PJ. Rheumatoid factor and false positive sex-hormone binding globulin. Clin Chim Acta. 2003 Jun;332 (1-2):139-41; author reply 143-4
  • Lewis JG, Lewis MG, Elder PA. An enzyme-linked immunosorbent assay for corticosteroid-binding globulin using monoclonal and polyclonal antibodies: decline in CBG following synthetic ACTH. Clin Chim Acta. 2003 Feb;328 (1-2):121-8
  • Lewis JG, Shand BI, Elder PA, Scott RS. Plasma sex hormone-binding globulin rather than corticosteroid-binding globulin is a marker of insulin resistance in obese adult males. Diabetes Obes Metab. 2004 Jul;6 (4):259-63
  • Mihrshahi R, Lewis JG, Ali SO. Hormonal effects on the secretion and glycoform profile of corticosteroid-binding globulin. J Steroid Biochem Mol Biol. 2006 Nov;101 (4-5):275-85
  • Sandberg AA, Rosenthal H, Mittelman A, Murphy GP. Prostatic cancer. Transcortin levels during treatment with estramustine phosphate. Urology. 1975 Jul;6 (1):17-21
  • Slaunwhite WR Jr, Nienhouse S, Rosenthal H, Woodruff M, Sandberg AA. Transcortin: A Corticosteroid-binding Protein of Plasma. VII. Half-Life in Normal and Estrogen-treated Subjects . J Clin Invest.. 1964 Mar; 43 :461-6
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