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The Determination of Total Testosterone and Free Testosterone (RIA) are not Applicable to the Evaluation of Gonadal Function in HIV-Infected Males

Authors


Oscar Moreno-Pérez, MD, Endocrinology and Nutrition, Hospital General Universitario de Alicante, Secretaria de Endocrinologia, 8° Planta de Consultas Externas, C/ Pintor Baeza s/n, Alicante 03010, Spain. Tel: (0034) 965913783; Fax: (0034) 965913783; E-mail: moreno_osc@gva.es

ABSTRACT

Introduction.  Hypogonadism is common in human immunodeficiency virus (HIV)-infected men; the high concentration of sex hormone binding globulin (SHBG) in this population, induces a “false increase” in total testosterone (TT) values.

Aims.  To validate the determination of TT and measured free testosterone (FT [radioimmunoassay {RIA} ] ) for hypogonadism diagnosis in an HIV-infected population using calculated free testosterone (CFT) as reference method; and also to determine the prevalence and identify the risks factors of hypogonadism.

Methods.  Cross-sectional, observational study. Ninety HIV-infected males (42 ± 8.2 years), not HCV coinfected, antiretroviral therapy (ART)-naive (14 patients), on current ART with enhanced protease inhibitor (PI) (39 patients), or patients on PI-naive ART (NN) (37 patients).

Main Outcome Measures.  CFT was calculated by determining TT, SHBG, and albumin (Vermeulen's formula); hypogonadism was defined as CFT <0.22 nmol/L (reference range for young healthy males in our laboratory); sensitivity of TT and FT (RIA) for hypogonadism diagnosis was calculated.

Results.  Twelve patients (13.3%, 95% confidence interval [CI] 7.8–21.9) by CFT presented hypogonadism. TT and FT (RIA) presented a sensitivity of less than 30% in the diagnosis of hypogonadism. Logistic regression multivariate analysis confirmed an independent association between hypogonadism, the patient's age per decade, odds ratio (OR) 6.9 (CI 1.9–24.8; P = 0.003), and longer duration of HIV infection per decade, OR 13.1 (CI 1.3–130.6; P = 0.02). Hypogonadism was associated with erectile dysfunction.

Conclusions.  TT and FT (RIA) are not useful in the differential diagnosis of hypogonadism in HIV-infected males. There is a significant prevalence of hypogonadism in HIV-infected males, with the patient's age and duration of the disease being the only identifiable risk factors. Moreno-Pérez O, Escoín C, Serna-Candel C, Portilla J, Boix V, Alfayate R, González-Sánchez V, Mauri M, Sánchez-Payá J, and Picó A. The determination of total testosterone and free testosterone (RIA) are not applicable to the evaluation of gonadal function in HIV infected males. J Sex Med 2010;7:2873–2883.

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