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Zhou H, Wang Y, Gatcombe M, Farris J, Botelho JC, Caudill SP, Vesper HW. Simultaneous measurement of total estradiol and testosterone in human serum by isotope dilution liquid chromatography tandem mass spectrometry. Anal Bioanal Chem 2017; 409:5943-5954. [PMID: 28801832 DOI: 10.1007/s00216-017-0529-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/05/2017] [Accepted: 07/18/2017] [Indexed: 12/13/2022]
Abstract
Reliable measurement of total testosterone and estradiol is critical for their use as biomarkers of hormone-related disorders in patient care and translational research. We developed and validated a mass spectrometry method to simultaneously quantify these analytes in human serum without chemical derivatization. Serum is equilibrated with isotopic internal standards and treated with acidic buffer to release hormones from their binding proteins. Lipids are isolated and polar impurities are removed by two serial liquid-liquid extraction steps. Total testosterone and estradiol are measured using liquid chromatography tandem mass spectrometry (LC-MS/MS) in combination of positive and negative electrospray ionization modes. The method shows broad analytical measurement range for both testosterone 0.03-48.5 nM (0.75-1400 ng/dL) and estradiol 11.0-5138 pM (2.99-1400 pg/mL) and excellent agreement with certified reference materials (mean bias less than 2.1% to SRM 971, BCR 576, 577, and 578) and a high order reference method (mean bias 1.25% for testosterone and -0.84% for estradiol). The high accuracy of the method was monitored and certified by CDC Hormone Standardization (HoSt) Program for 2 years with mean bias -0.7% (95% CI -1.6% to 0.2%) for testosterone and 0.1% (95% CI -2.2% to 2.3%) for estradiol. The method precision over a 2-year period for quality control pools at low, medium, and high concentrations was 2.7-2.9% for testosterone and 3.3-5.3% for estradiol. With the consistently excellent accuracy and precision, this method is readily applicable for high-throughput clinical and epidemiological studies.
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Affiliation(s)
- Hui Zhou
- Centers For Disease Control and Prevention, National Center For Environmental Health, Division of Laboratory Sciences, Clinical Chemistry Branch, 4770 Buford Hwy NE, Atlanta, GA, 30341, USA
| | - Yuesong Wang
- Centers For Disease Control and Prevention, National Center For Environmental Health, Division of Laboratory Sciences, Clinical Chemistry Branch, 4770 Buford Hwy NE, Atlanta, GA, 30341, USA
| | - Matthew Gatcombe
- Centers For Disease Control and Prevention, National Center For Environmental Health, Division of Laboratory Sciences, Clinical Chemistry Branch, 4770 Buford Hwy NE, Atlanta, GA, 30341, USA
| | - Jacob Farris
- Centers For Disease Control and Prevention, National Center For Environmental Health, Division of Laboratory Sciences, Clinical Chemistry Branch, 4770 Buford Hwy NE, Atlanta, GA, 30341, USA
| | - Julianne C Botelho
- Centers For Disease Control and Prevention, National Center For Environmental Health, Division of Laboratory Sciences, Clinical Chemistry Branch, 4770 Buford Hwy NE, Atlanta, GA, 30341, USA
| | - Samuel P Caudill
- Centers For Disease Control and Prevention, National Center For Environmental Health, Division of Laboratory Sciences, Clinical Chemistry Branch, 4770 Buford Hwy NE, Atlanta, GA, 30341, USA
| | - Hubert W Vesper
- Centers For Disease Control and Prevention, National Center For Environmental Health, Division of Laboratory Sciences, Clinical Chemistry Branch, 4770 Buford Hwy NE, Atlanta, GA, 30341, USA.
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