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• W2038142605 abstract "OBJECTIVES The prevalence of gestational transient thyrotoxicosis (GTT) in Europeans evaluated during the 8th to 14th weeks of pregnancy is 2–3%. However, there is evidence that GTT may be more common in some Asian populations. The aims of this study were to evaluate the prevalence of thyroid hormone abnormalities in Asian women in their 8th to 14th weeks of pregnancy using highly sensitive free T4 and TSH assays and to correlate these with total and free β‐hCG levels. DESIGN AND PATIENTS One hundred and eighty‐four consecutive unselected Asian (Singaporean) pregnant women seen at ante‐natal clinics for the first time and who were in their 8th to 14th weeks of pregnancy were tested. MEASUREMENTS Serum free T4, free T3, TSH, total β‐hCG and free β‐HCG levels were measured on the Vitros ECi system (Johnson & Johnson Ortho‐Clinical Diagnostics, Amersham, UK) which employs chemiluminescent immunochemical technology. This free T4 assay is free of biases related to serum binding capacity. The TSH assay used was a third generation assay. Thyrotrophin‐receptor antibody (TRAb) levels were measured using LUMItest TRAK (BRAHMS Diagnostica, Berlin, Germany). RESULTS Two subjects (1·1%) were found to have Graves' disease. Elevated free T4, free T3, total T3 and suppressed TSH were seen in 14·8%, 3·3%, 26·4% and 33·0% of the remaining 182 pregnant women, respectively. Total and free β‐hCG correlated negatively with TSH ( r = −0·30, P < 0·0001 and r = −0·29, P < 0·0001, respectively), positively with fT4 ( r = 0·283, P < 0·001 and r = 0·253, P < 0·001) and fT3 ( r = 0·273, P < 0·001 and r = 0·204, P < 0·01). 11·0% of cases had gestational thyrotoxicosis (GT) defined as elevated free T4 (> 19·1 pmol/l), suppressed TSH (< 0·36 mIU/l) and TRAb levels within the reference interval (0–0·9 U/l). The prevalence of GT was significantly higher in patients tested at 8–11 weeks compared to those evaluated at 12–14 weeks (14·4% vs. 4·7%, P < 0·05). Total β‐hCG ( P = 0·0002), free β‐hCG ( P < 0·0001) and free T4 ( P = 0·02) levels were higher and TSH levels ( P = 0·01) lower in patients tested at 8–11 weeks. Significant positive correlations between both total and free β‐hCG with free T4 were seen at 8–11 weeks but not in patients tested at 12 weeks or later. TT3 levels were similar in the two groups. CONCLUSIONS Using sensitive assays, the prevalence of gestational thyrotoxicosis in Asian women was found to be 11·0% and was significantly higher in subjects at 8–11 weeks of gestation than at 12–14 weeks. The positive correlation between hCG and free T4 seen in patients tested at 8–11 weeks was absent in patients tested at later stages of the first trimester. Future studies investigating the entity of gestational thyrotoxicosis, at least in Asian patients, should focus on patients at earlier stages of gestation than currently practised." @default.
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• W2038142605 date "2001-09-01" @default.
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• W2038142605 title "Prevalence of gestational thyrotoxicosis in Asian women evaluated in the 8th to 14th weeks of pregnancy: correlations with total and free beta human chorionic gonadotrophin" @default.
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• W2038142605 doi "https://doi.org/10.1046/j.1365-2265.2001.01353.x" @default.
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