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Departamento de Bioquímica Clínica. Facultad de Farmacia y Bioquímica. Universidad de Buenos Aires. Buenos Aires. Argentina" "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] 1 => array:3 [ "entidad" => "Laboratorio Central. Sección RIA. Hospital Churruca-Visca. Buenos Aires. Argentina" "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff2" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "⁎" "correspondencia" => "Correspondencia: Dra. V. Mesch. Junín 956. (1113) Buenos Aires. Argentina." ] ] ] ] "titulosAlternativos" => array:1 [ "en" => array:1 [ "titulo" => "Comparison of two methods for bioavailable testosterone assessment in women" ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2006-01-02" "fechaAceptado" => "2006-07-19" "PalabrasClave" => array:2 [ "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec134885" "palabras" => array:3 [ 0 => "Testosterona biodisponible" 1 => "Precipitación con sulfato de amonio" 2 => "Hiperandrogenismo" ] ] ] "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Key words" "identificador" => "xpalclavsec134886" "palabras" => array:3 [ 0 => "Bioavailable testosterone" 1 => "Ammonium sulfate precipitation" 2 => "Hyperandrogenism" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "es" => array:1 [ "resumen" => "<span class="elsevierStyleSectionTitle">Fundamento y objetivo</span><p class="elsevierStyleSimplePara elsevierViewall">La evaluación androgénica en la mujer es requerida en el diagnóstico de diversas afecciones tales como irregularidades menstruales, hirsutismo y acné, en las cuales se prefiere medir la testosterona biodisponible a la testosterona total, ya que la primera refleja la testosterona biológicamente activa. Ésta puede determinarse mediante una técnica de precipitación selectiva o por cálculo a partir de la medición de testosterona total y de la globulina transportadora de esteroides sexuales (SHBG). Nuestro objetivo fue comparar los resultados de testosterona biodisponible obtenidos por precipitación con sulfato de amonio con los calculados en 4 grupos de mujeres con diferentes concentraciones androgénicas.</p> <span class="elsevierStyleSectionTitle">Pacientes y métodos</span><p class="elsevierStyleSimplePara elsevierViewall">Se estudió a 27 mujeres normales con ciclos menstruales regulares (A), 26 mujeres hiperandrogénicas (B), 11 mujeres hipertiroideas (C) y 15 mujeres embarazadas normales (D). Se determinó en todos los casos testosterona total y SHBG para el cálculo de testosterona biodisponible, la cual fue evaluada también por precipitación con sulfato de amonio.</p> <span class="elsevierStyleSectionTitle">Resultados</span><p class="elsevierStyleSimplePara elsevierViewall">Se encontró una correlación significativa entre los dos métodos para evaluar testosterona biodisponible en los primeros 3 grupos, pero no en el grupo D. En los grupos A y C, el análisis de concordancia de Bland y Altman mostró un sesgo bajo. Los grupos B y D presentaron un sesgo más alto que los grupos A y C, sin superposición de valores entre mujeres normales e hiperandrogénicas.</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p class="elsevierStyleSimplePara elsevierViewall">La determinación de testosterona biodisponible por cálculo es equivalente a medirla por precipitación con sulfato de amonio en mujeres normales, hiperandrogénicas e hipertiroideas, no así en mujeres embarazadas.</p>" ] "en" => array:1 [ "resumen" => "<span class="elsevierStyleSectionTitle">Background and objective</span><p class="elsevierStyleSimplePara elsevierViewall">Androgenic status evaluation is often required in women as a diagnostic tool in the assessment of menstrual irregularity, hirsutism and acne. There is good evidence that the non specifically bound testosterone (bioavailable To) more accurately reflects the clinical situation than total testosterone, so bioavailable To assessment is more useful in these women. The latter can be determined by a selective precipitation method or through a mathematical calculation that requires total testosterone and SHBG concentrations. The aim of our study was to compare bioavailable To levels obtained with the ammonium sulfate precipitation technique with those obtained with a mathematical calculation in four groups of women with different androgenic levels.</p> <span class="elsevierStyleSectionTitle">Patients and methods</span><p class="elsevierStyleSimplePara elsevierViewall">We studied 79 adult women divided into the following groups: 27 normal women with regular menstrual cycles (A), 26 hyperandrogenic women (B), 11 hyperthyroid women (C) and 15 normal pregnant women (D). All samples were assayed for total To and SHBG by chemiluminiscent methods in order to calculate bioavailable To, which was also determined by ammonium sulfate precipitation.</p> <span class="elsevierStyleSectionTitle">Results</span><p class="elsevierStyleSimplePara elsevierViewall">We found a significant correlation between the two methods for bioavailable testosterone in the first three groups but not in group D. In groups A and C, Bland and Altman correlation showed a low bias. Groups B and D showed higher bias than groups A and C, with no overlapping of values between normal and hyperandrogenic women.</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p class="elsevierStyleSimplePara elsevierViewall">The mathematical calculation and the ammonium precipitation technique are equivalent in assessing bioavailable testosterone in normal, hyperandrogenic and hyperthyroid women but not in pregnant women.</p>" ] ] "bibliografia" => array:2 [ "titulo" => "Bibliografía" "seccion" => array:1 [ 0 => array:1 [ "bibliografiaReferencia" => array:14 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1." "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Androgen production in women" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "H. 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Comparación de dos métodos para la determinación de testosterona biodisponible en mujeres
Comparison of two methods for bioavailable testosterone assessment in women
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Comparación de dos métodos para la determinación de testosterona biodisponible en mujeres
Viviana Mesch, Lydia Ferreiro, Fernando Grupico, Liana Sciarretta, Alberto del Río
10.1016/S1575-0922(07)71412-2Endocrinol Nutr. 2007;54:89-95