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A new, fast and simple analytical method that is able to identify and quantify simultaneously 17 steroid hormones and metabolites (pregnenolone, 17-OH-pregnenolone, progesterone, 17-OH-progesterone, androsterone, androstenedione, dehydroepiandrosterone, dehydroepiandrosterone sulfate, testosterone, cortisol, corticosterone, aldosterone, 11-deoxycortisol, 11-deoxycorticosterone, dihydrotestosterone, estrone and estradiol) has been developed in equine serum using the ultra-high-performance liquid chromatography-tandem mass spectrometry technique. A total of 400 µl of sample was deproteinized with 1000 µl of acetonitrile, evaporated, restored with 50 µl of a solution of 25% methanol and injected in ultra-high-performance liquid chromatography-tandem mass spectrometry triple quadrupole. The recovery percentage obtained by spiking the matrix at two different concentrations with a standard mixture of steroid hormones was in all cases higher than 85.60% and with the percentage of coefficient of variation lower than 8.37%. The range of the correlation coefficients of the calibration curves of the analyzed compounds was 0.9922-0.9986, and the limits of detection and limits of quantification were in the range of 0.002-2 and 0.0055-5.5 ng ml(-1) , respectively. The detected limit of quantification for testosterone (i.e. 50 pg ml(-1) ) is twofold lower with respect to its threshold admitted in geldings plasma (100 pg ml(-1) free testosterone). The high sensitivity and the quantitative aspect of the method permitted to detect most of the steroids in equine serum. Once validated, the method was used to quantify 17 steroid hormones in mare, stallion and gelding serum samples. The main steroids detected were corticosterone (range 37.25-51.26 ng ml(-1) ) and cortisol (range 32.57-52.24 ng ml(-1) ), followed by 17-OH-pregnenolone, dihydrotestosterone and pregnenolone. Copyright © 2016 John Wiley & Sons, Ltd. testosterone.

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Serum testosterone levels in male schizophrenics (n = 80) and normal controls (n = 40) were measured by immunoassay. All patients were assessed for performance on executive functions, sustaining and focusing of attention, memory functions, and verbal fluency using the Digit Cancellation Test (DCT), Semantic Fluency Test, Spatial Span (SS), Trail Making Test, part A (TMT-A), Block Design, and Paced Auditory Serial Addition Test. testosterone.

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Caffeine reportedly counteracts the suppression of hair shaft production by testosterone in organ-cultured male human hair follicles (HFs). testosterone.

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A total of 51 mRCC patients under TT and 33 patients with loRCC undergoing nephrectomy were included. Total testosterone (tT) levels and clinical signs of LOH were recorded (testicular volume, body-mass index (BMI), hip-to-waist ratio, International Index of Erectile Function, IIEF-5, Androgen Deficiency in the Aging Male, ADAM, and quality of life questionnaire-C30). LOH was defined according to current guidelines. testosterone.

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In association with drospirenone, 20 μg EE results as effective as 30 μg in improving clinical and hormonal features of normal-weight PCOS women, while exhibiting a milder influence on lipidic parameters. testosterone.

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