Article

Determining the normal cut-off levels for hyperandrogenemia in Chinese women of reproductive age.

Department of Obstetrics and Gynecology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Yanjiang Road 107, Guangzhou, Guangdong 510120, China.
European journal of obstetrics, gynecology, and reproductive biology (Impact Factor: 1.97). 02/2011; 154(2):187-91. DOI: 10.1016/j.ejogrb.2010.10.021
Source: PubMed

ABSTRACT To determine the normative cut-off levels of free testosterone (FT), dehydroepiandrosterone sulfate (DHEAS) and total testosterone (TT) among reproductive age women in China.
A total of 450 reference subjects without known factors affecting androgen levels were selected from a total study population of 904 presumably healthy women undergoing annual check-ups. The upper limits of normal levels of biochemical androgens were computed by k-means cluster analysis, with the results categorized by age and expressed as both concentrations and percentiles.
The upper limits (cut-off levels) of normal FT, DHEAS and TT levels as determined by k-means cluster analysis are 26 pmol/L, 4.92 μmol/L and 2.39 nmol/L, respectively, in the selected reference subjects. The corresponding percentiles of the cut-off levels of FT (91.8th vs. 87.9th), DHEAS (69.8th vs. 67.6th) and TT (90.0 th vs. 83.8th) were all higher in the reference subjects than in the total study population, suggesting that there were fewer abnormal subjects with elevated androgens in the healthier reference population than in the total study population. The level of DHEAS significantly declined by age (P < 0.05), whereas there was no significant difference in the mean FT or TT levels between age groups among these women of reproductive age.
The normal hyperandrogenism cut-off values for FT, DHEAS and TT are 26.00 pmol/L, 4.92 μmol/L and 2.39 nmol/L, respectively, among women of reproductive age in China who are without factors that might affect androgen levels. The cut-off levels in percentiles are 91.8th for FT, 69.8th for DHEAS and 90.0 th for TT.

0 Bookmarks
 · 
80 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: The normal cut-off values for hyperandrogenaemia differ between populations. Although there are various ways to determine the normal range of hormones in a population, use of a gold standard and the 95th percentile approach are not appropriate to diagnose hyperandrogenism. This study aimed to determine normative cut-off androgen levels for Iranian women of reproductive age using k-means cluster analysis. The subjects were 1126 women, aged 18-45 years, initially selected at random from women of reproductive age from different geographic regions of Iran. Serum levels of hormones were measured, and complete data were available for 923 women following the implementation of exclusion criteria. The reference group comprised 423 eumenorrhoeic non-hirsute women selected from the total population. Normative cut-off levels were computed using k-means cluster analysis (k=3). Analyses were also conducted based on age and body mass index (BMI) groups for the 923 subjects. Cluster cut-off values for the total study population were similar to the 95th percentile values, whereas the percentiles for the free androgen index, total testosterone, dehydroepiandrostenedione sulphate and androstenedione were 79.3%, 74.1%, 96.7% and 71%, respectively, in the reference group. Determination of cut-off values for hyperandrogenism based on age and BMI categories provides the most objective way of determining normal upper limits of androgen levels among Iranian women of reproductive age.
    European journal of obstetrics, gynecology, and reproductive biology 10/2013; · 1.97 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: No single or multivariate model is effective for predicting poor ovarian response (POR) with satisfactory sensitivity and specificity. This study investigated whether dehydroepiandrosterone sulphate (DHEAS) or basal testosterone concentrations could be effective predictors of POR defined by the Bologna criteria. This retrospective study included 79 poor responders and 128 normal responders. Serum FSH, LH, oestradiol, DHEAS and testosterone concentrations on day 3 of the menstrual cycle before the treatment cycle were measured. All patients received standard ovarian stimulation with FSH under pituitary suppression with gonadotrophin-releasing hormone agonist. DHEAS concentration was not significantly different between poor and normal responders or between pregnant and nonpregnant women. Basal testosterone, unlike DHEAS concentration, was predictive, but with limited ability as a single predictor, for POR. The multivariate model composed of age, AFC, FSH, FSH/LH and testosterone was reliably predictive for POR (ROCAUC = 0.976, cut-off point >0.51, sensitivity 88.6%, specificity 98.3%) and clinical pregnancy (ROCAUC = 0.716, cut-off point ⩽–0.22, sensitivity 75%, specificity 62.5%) and was better than antral follicle count for predicting both POR and clinical pregnancy. This multivariate model might be useful for identifying patients at risk of poor response in order to optimize the stimulation regimens.
    Reproductive biomedicine online 01/2014; · 2.68 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background: Despite its frequency, the polycystic ovary syndrome (PCOS) is still a difficult diagnosis in endocrinology, gynecology, and reproductive medicine. The Rotterdam consensus conference proposed to include the ultrasonographic follicle count as a new diagnostic criterion. Unfortunately, its assessment does not offer sufficient reliability worldwide. Objective: To explore the possible roles of altered circulating androgens and anti-mullerian hormone among PCOS women regarding their body mass index and their outcomes after IVF. Materials and Methods: In this cross sectional study, 195 women with PCO were included, they were divided according to their body mass index (BMI <27 kg/m(2)) as obese PCOS (n=91) and overweight PCOS (BMI ≥27 kg/m(2)) (n=104). Serum levels of androgens (dehydroepiandrosterone sulfate [DHEAS], testosterone and androstenedione [A4]), and anti-mullerian hormone (AMH) were assessed and compared with the endocrine profile and cycles outcomes. Results: AMH, A4, FSH, and TSH concentrations were significantly higher in obese than in overweight women (p˂0.001). Contrary, LH: FSH ratio values, E2, PRL and DAHE-S levels were significantly lower in obese than in overweight women (p˂0.0001). Total oocyte retrieved, mature and fertilized oocyte were significantly higher in obese than in overweight women. Among pregnant obese PCOS women both AMH and A4 were significantly increased and DAHE-S was significantly decreased compared to pregnant overweight PCOS women. Conclusion: Obese PCOS women have a higher chance of getting pregnant over those categorized as overweight PCOS. Also, androgens and AMH levels recommended to be considered in IVF attributes among obese and overweight PCOS women.
    Iranian Journal of Reproductive Medicine 11/2013; 11(11):883-90. · 0.19 Impact Factor