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Methods: We enrolled 498 healthy Japanese men. Total testosterone was assayed by liquid chromatography tandem mass spectrometry, sex hormone-binding globulin was assayed by immunoassay and free testosterone was calculated by a laboratory at the Boston Medical Center. Analog-based free testosterone and immunoassay-based total testosterone were determined by immunoassay. We compared mass spectrometry assay-based total testosterone and calculated free testosterone values in the Japanese participants with values in the American Framingham Heart Study third generation cohort. Results: The mean serum mass spectrometry assay-based total testosterone, sex hormone-binding globulin, and calculated free testosterone values were 439.4±167ng/dL, 65.34±30.61nmol/L, and 58.75±20.0pg/mL, respectively. The correlation coefficients with age for mass spectrometry assay-based total testosterone, sex hormone-binding globulin, and calculated free testosterone were 0.0010, 0.5041, and -0.496, respectively. There were no age-related changes in mass spectrometry assay-based total testosterone values in healthy men (P=0.981), whereas sex hormone-binding globulin and calculated free testosterone levels showed similar age-related changes (P\u003c0.0001). Serum analog-based free testosterone levels (8.24±2.9pg/mL) showed age-related changes (P\u003c0.0001) regardless of immunoassay-based total testosterone levels (P=0.828). Serum immunoassay-based total testosterone values (486.1±162.5ng/dL) correlated with serum mass spectrometry assay-based total testosterone values (r=0.740, 95% confidence interval 0.6965-0.7781, P\u003c0.0001). Similarly, analog-based free testosterone and calculated free testosterone values showed a highly significant correlation (r=0.706, 95% confidence interval 0.6587-0.7473, P\u003c0.0001). The analog-based free testosterone values were approximately 10% of the calculated free testosterone values. Conclusions: In contrast to the Framingham Heart Study cohort, total testosterone values in Japanese men are not associated with advancing age; thus, they cannot be used to diagnose late-onset hypogonadism in Japan. 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Comparison of testosterone fractions between Framingham Heart Study participants and Japanese participants
http://hdl.handle.net/2297/36513
http://hdl.handle.net/2297/3651354800b49-06f5-45cf-b8b7-5a90bb4ef94a
名前 / ファイル | ライセンス | アクション |
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ME-PR-KOH-E-689.pdf (510.9 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-10-03 | |||||
タイトル | ||||||
タイトル | Comparison of testosterone fractions between Framingham Heart Study participants and Japanese participants | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Taya, Masaki
× Taya, Masaki× Koh, Eitetsu× Izumi, Kouji× Iijima, Masashi× Maeda, Yuji× Matsushita, Tomohiko× Iwamoto, Teruaki× Namiki, Mikio |
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書誌情報 |
International Journal of Urology 巻 21, 号 7, p. 689-695, 発行日 2014-07-01 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0919-8172 | |||||
NCID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11042471 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1111/iju.12393 | |||||
出版者 | ||||||
出版者 | Japanese Urological Association 日本泌尿器科学会 / Wiley-Blackwell | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Objectives: To determine testosterone fractions in Japanese men and to compare these values with those of Framingham Heart Study participants. Methods: We enrolled 498 healthy Japanese men. Total testosterone was assayed by liquid chromatography tandem mass spectrometry, sex hormone-binding globulin was assayed by immunoassay and free testosterone was calculated by a laboratory at the Boston Medical Center. Analog-based free testosterone and immunoassay-based total testosterone were determined by immunoassay. We compared mass spectrometry assay-based total testosterone and calculated free testosterone values in the Japanese participants with values in the American Framingham Heart Study third generation cohort. Results: The mean serum mass spectrometry assay-based total testosterone, sex hormone-binding globulin, and calculated free testosterone values were 439.4±167ng/dL, 65.34±30.61nmol/L, and 58.75±20.0pg/mL, respectively. The correlation coefficients with age for mass spectrometry assay-based total testosterone, sex hormone-binding globulin, and calculated free testosterone were 0.0010, 0.5041, and -0.496, respectively. There were no age-related changes in mass spectrometry assay-based total testosterone values in healthy men (P=0.981), whereas sex hormone-binding globulin and calculated free testosterone levels showed similar age-related changes (P<0.0001). Serum analog-based free testosterone levels (8.24±2.9pg/mL) showed age-related changes (P<0.0001) regardless of immunoassay-based total testosterone levels (P=0.828). Serum immunoassay-based total testosterone values (486.1±162.5ng/dL) correlated with serum mass spectrometry assay-based total testosterone values (r=0.740, 95% confidence interval 0.6965-0.7781, P<0.0001). Similarly, analog-based free testosterone and calculated free testosterone values showed a highly significant correlation (r=0.706, 95% confidence interval 0.6587-0.7473, P<0.0001). The analog-based free testosterone values were approximately 10% of the calculated free testosterone values. Conclusions: In contrast to the Framingham Heart Study cohort, total testosterone values in Japanese men are not associated with advancing age; thus, they cannot be used to diagnose late-onset hypogonadism in Japan. The analog-based free testosterone value can be considered instead as a suitable biochemical determinant for diagnosing late-onset hypogonadism syndrome. © 2014 The Japanese Urological Association. | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://www.urol.or.jp/ |