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• W2025749067 abstract "BACKGROUND AND OBJECTIVE Maternal Serum immunoreactive inhibin has been shown to be significantly elevated in Down's affected pregnancies in the second trimester, suggesting that it may be useful in prenatal diagnosis. We have investigated whether it is similarly elevated in the first trimester. DESIGN Stored maternal sera from women with Down's affected pregnancies and chromosomally normal control pregnancies were retrieved for analysis. These sera had been collected prospectively at either 11 or 12 weeks gestation as a routine antenatal booking procedure. SUBJECTS From records, 11 women were identified as having had a Down's pregnancy. For each of these, 4 controls matched for gestation and duration-of-storage were also identified. MEASUREMENTS Two different inhibin immunoassays were evaluated, one using an antibody raised against 31 kDa bovine inhibin and the other, a commercial two-site assay, using two antibodies directed against two distinct α-subunit epitopes. RESULTS Neither assay detected a significant effect of gestation on serum inhibin levels. After combining the data from both gestations, no significant difference between the Down's samples and controls for either assay was detected. However, analysis of the data for each gestation separately revealed that one assay detected a significant difference in inhibln levels between Down's affected and unaffected pregnancies at 11 weeks gestation (mean ± SEM 3186 ± 195 vs 2020 ± 172ng/l, P < 0·01) but not at 12 weeks. The other, commercial, assay did not detect a significant difference at either gestation. In addition, there was poor association between the results of the two assays. CONCLUSIONS These data suggest that immunoreactive inhibin, as detected by these assays, will not be useful as a late first trimester marker for Down's syndrome and also that these two assays detect different inhibin species in pregnancy serum." @default.
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• W2025749067 date "1994-10-01" @default.
• W2025749067 modified "2023-09-27" @default.
• W2025749067 title "Evaluation of maternal serum immunoreactive inhibin as a first trimester marker of Down's syndrome" @default.
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• W2025749067 doi "https://doi.org/10.1111/j.1365-2265.1994.tb02579.x" @default.
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