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androstenedione levels by LC–MS/MS, an IVD-MS steroids serum kit (MassChrom, Steroids in Serum/Plasma, Chromsystems, Gräfelfing, Germany) was used. Chromatographic separation and mass spectrometry of the samples was performed with a high-performance liquid
Fondazione Italiana Ricerca sulle Malattie dell’Osso (FIRMO Onlus), Florence, Italy
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to a reference procedure (isotope dilution mass spectrometry) and automatized on a Cobas 8000. Serum VDBP was measured by enzyme-linked immuno assay method (R&D Systems). BPA analysis was performed on urine samples using the HPLC/mass spectrometry by
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Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil
Department of Pediatrics, Universidade Federal do Rio Grande do Sul (UFRGS), Medical School, Porto Alegre, RS, Brazil
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spectrometry . Clinica Chimica Acta 2010 411 222 – 228 . ( https://doi.org/10.1016/j.cca.2009.11.007 ) 29 Carvalho VM Nakamura OH & Vieira JGH . Simultaneous quantitation of seven endogenous C-21 adrenal steroids by liquid chromatography tandem mass
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, 32 , 33 , 34 ). Another possible limitation of the present study could be the measurement of total testosterone by RIA and not with the liquid chromatography-tandem mass spectrometry (LC-MS) method. However, LC-MS is not widely used due to the costs
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, mineralocorticoids and sex hormones are a challenge because of the relatively low specificity of ELISA and RIA. Hence, the state-of-the-art method is a liquid chromatography–tandem mass spectrometry (LC–MS/MS) steroid profiling method ( 7 ), which we have used in
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Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
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were stored at −20°C and then at −80°C. Samples were thawed only once just before analysis. Laboratory analysis The analysis of cortisol metabolites was conducted at the Edinburgh Clinical Research Facility Mass Spectrometry Core Laboratory
Tropical Institute of Reproductive Medicine and Menopause, Cuiabá, Mato Grosso, Brazil
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study for T, 17-OHPE, 17-OHP4, and compound S and liquid chromatography tandem mass spectrometry have shown good agreement between the methods ( 28 , 29 ). Some adipocyte-derived products may induce the transcription of the StAR promoter protein and
Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna, Bologna, Italy
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Unit of Gynecology and Obstetrics, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Italy
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OH-progesterone, and progesterone) by liquid chromatography-tandem mass spectrometry (LC-MS/MS), at the Center for Applied Biomedical Research of the University of Bologna, S. Orsola Hospital. The same day, a medical examination was made, during
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permitted adjustments and thus, an estimation of the correlation between insulin at baseline and testosterone at follow-up. Second, measurements of testosterone were made with radioimmunoassay, which is considered less reliable than mass spectrometry
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with European-Americans when DBP was measured with an immunoassay using monoclonal DBP antibodies, but not when measured with a mass spectrometry or immunoassays using polyclonal DBP antibodies ( 11 , 12 , 13 , 14 , 15 ). In a previous study, we