REFERENCES
- Orth DN. Cushing's syndrome. New Engl J Med 1995; 332: 791–803.
- Murphy BEP. Clinical evaluation of urinary cortisol determinations by competitive protein-binding radioassay. J Clin Endocrinol 1968; 28: 343–8.
- Ruder HJ, Guy RL, Lipsett MB. A radioimmuno-assay for cortisol in plasma and urine. J Clin Endocrinol Metab 1972; 35: 219–24.
- Schöneshofer M, Fenner A, Altinok G, Dulce HJ. Specific and practicable assessment of urinary free cortisol by combination of automatic high-pressure liquid chromatography and radioimmuno-assay. Clin Chim Acta 1980; 106: 63–73.
- Canalis E, Reardon GE, Caldarella AM. A more specific, liquid-chromatographic method for free cortisol in urine. Clin Chem 1982; 28: 2418–20.
- Turpeinen U, Markkanen H, Valimaki M, Stenman U-H. Determination of urinary free cortisol by HPLC. Clin Chem 1997; 43: 1386–91.
- Fluri K, Rivier L, Dienes-Nagy A, You C, Maitre A, Schweizer C, Saugy M, Mangin P. Method for confirmation of synthetic corticosteroids in doping urine samples by liquid chromatography-electrospray ionisation mass spectrometry. J Chromatogr 2001; 926: 87–95.
- Antignac J-P, Le Bizec B, Monteau F, Poulain F, Andre F. Multi-residue extraction-purification procedure for corticosteroids in biological samples for efficient control of their misuse in livestock production. J Chromatogr 2001; 757: 11–9.
- Murphy BEP, Okouneff LM, Klein GP, Ngo SC. Lack of specificity of cortisol determinations in human urine. J Clin Endocrinol Metab 1981; 53: 91–9.
- Schöneshöfer M, Weber B. Specific estimation of fifteen unconjugated, non-metabolized steroid hormones in human urine. Steroid Biochem 1983; 18: 65–73.
- McWhinney BC, Ward G, Hickman PE. Improved HPLC method for simultaneous analysis of cortisol, 11-deoxycortisol, prednisolone, methyl-prednisolone, and dexamethasone in serum and urine. Clin Chem 1996; 42: 979–81.
- Holder G. External quality assessment of urinary-free cortisol measurement in the UK against a gas chromatography mass spectroscopy reference method. Ann Clin Biochem 1995; 32: 84–90.
- Murphy BEP. Urinary free cortisol determina-tions: what they measure. The Endocrinologist 2002; 12: 143–50.
- Rizea Savu S, Silvestro L, Haag A, Sorgel F. A confirmatory HPLC-MS/MS method for ten synthetic corticosteroids in bovine urines. J Mass Spectrom 1996; 31: 1351–63.
- Morineau G, Gosling J, Patricot M-C, Soliman H, Boudou P, Al Halnak A, Le Brun G, Brerault J-L, Julien R, Villette J-M, Fiet J. Convenient chro-matographic prepurification step before measure-ment of urinary cortisol by radioimmunoassay. Clin Chem 1997; 43: 786–93.
- Murphy BEP. How much "UFC" is really cortisol? Clin Chem 2000; 46: 793–4.
- Santos-Montes A, Gonzalo-Lumbreras R, Izquierdo-Hornillos R. Simultaneous determina-tion of cortisol and cortisone in urine by reversed-phase high-performance liquid chromatography. Clinical and doping control applications. J Chromatogr 1995; 673: 27–33.
- Taylor RL, Machacek D, Singh R. Validation of a high-throughput liquid chromatography-tandem mass spectrometry method for urinary cortisol and cortisone. Clin Chem 2002; 48: 1511–9.
- Bonfiglio R, King RC, Olah TV, Merkle K. The effects of sample preparation methods on the variability of the electrospray ionization response for model drug compounds. Rapid Commun Mass Spectrom 1999; 13: 1175–85.
- Matuszewski BK, Constanzer ML, Chavez-Eng CM. Matrix effect in quantitative LC/MS/MS analyses of biological fluids: a method for determination of finasteride in human plasma at picogram per milliliter concentrations. Anal Chem 1998; 70: 882–9.