Publication: Normative values of second-trimester maternal serum markers using an automated assay platform for down syndrome screening
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Issued Date
2019-01-01
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22288082
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2-s2.0-85063488060
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Mahidol University
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SCOPUS
Bibliographic Citation
Siriraj Medical Journal. Vol.71, No.1 (2019), 21-24
Suggested Citation
Kusol Russameecharoen, Katika Nawapun, Buraya Phattanachindakun, Vitaya Titapant, Tuangsit Wataganara, Nisarat Phithakwatchara Normative values of second-trimester maternal serum markers using an automated assay platform for down syndrome screening. Siriraj Medical Journal. Vol.71, No.1 (2019), 21-24. doi:10.33192/Smj.2019.04 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/52129
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Title
Normative values of second-trimester maternal serum markers using an automated assay platform for down syndrome screening
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Abstract
© 2019 Siriraj Medical Journal. Objective: Automated chemiluminescent immunoassay has several advantages over manual ELISA with comparable test performance. Few studies have reported the reference values of the second-trimester serum markers maternal serum alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), unconjugated estriol (uE3), and inhibin A (Inh A) by automated immunoassay in Asian population. Accordingly, this study aimed to determine the median values of second trimester serum markers as a function of gestational age (GA) in Thai population using an automated immunoassay. Methods: This prospective cross-sectional study of serum markers in healthy singleton second trimester (14-22 weeks) pregnant women was conducted at Siriraj Hospital from September 2012 to April 2015. Maternal serum AFP, hCG, uE3, and Inh A were analyzed by automated immunoassay. Predicted median values as a function of GA were calculated from best-fit regression equations. Results: A total of 1,526 women were included. Median values serum markers were constructed from the following optimal models: AFP (ng/mL) = 99.082 - 14.195 GA + 0.662 GA 2 , r 2 =0.995; hCG (mIU/mL) = 390168.106 - 35 968.397GA + 876.708GA 2 , r 2 =0.972; uE3 (ng/mL) = -3.388 + 0.274 GA, r 2 =0.997; and, Inh-A (pg/mL) = 1206.875 - 114.171 GA + 3.174 GA 2 , r 2 =0.882. Using the same platform analysis and maternal weight adjustment, the reference values in Thai population were shown to be different from those of other ethnicities. Conclusion: Median values of second-trimester serum markers for Thai population were determined. Maternal weight and the use of population-specific normal values have to be taken into account for Down syndrome screening in the second trimester.