![Table 3 from The clinical usefulness of biochemical (free β-hCg, PaPP-a) and ultrasound (nuchal translucency) parameters in prenatal screening of trisomy 21 in the first trimester of pregnancy. | Semantic Scholar Table 3 from The clinical usefulness of biochemical (free β-hCg, PaPP-a) and ultrasound (nuchal translucency) parameters in prenatal screening of trisomy 21 in the first trimester of pregnancy. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/df64feabd4c7afce8285ca4067ceaa0fef4aeb8e/5-Table3-1.png)
Table 3 from The clinical usefulness of biochemical (free β-hCg, PaPP-a) and ultrasound (nuchal translucency) parameters in prenatal screening of trisomy 21 in the first trimester of pregnancy. | Semantic Scholar
![Clinical consequences of maternal serum PAPP-A and free beta hCG levels above 2.0 multiple of median in the first trimester screening - ScienceDirect Clinical consequences of maternal serum PAPP-A and free beta hCG levels above 2.0 multiple of median in the first trimester screening - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0301211523000246-gr1.jpg)
Clinical consequences of maternal serum PAPP-A and free beta hCG levels above 2.0 multiple of median in the first trimester screening - ScienceDirect
![First‐trimester screening for trisomy 21 by free beta‐human chorionic gonadotropin and pregnancy‐associated plasma protein‐A: impact of maternal and pregnancy characteristics - Kagan - 2008 - Ultrasound in Obstetrics & Gynecology - Wiley First‐trimester screening for trisomy 21 by free beta‐human chorionic gonadotropin and pregnancy‐associated plasma protein‐A: impact of maternal and pregnancy characteristics - Kagan - 2008 - Ultrasound in Obstetrics & Gynecology - Wiley](https://obgyn.onlinelibrary.wiley.com/cms/asset/7cdc4a89-0faf-4c83-80e5-ae8ceb8929c0/mfig007.jpg)
First‐trimester screening for trisomy 21 by free beta‐human chorionic gonadotropin and pregnancy‐associated plasma protein‐A: impact of maternal and pregnancy characteristics - Kagan - 2008 - Ultrasound in Obstetrics & Gynecology - Wiley
![Free β-human chorionic gonadotropin, total human chorionic gonadotropin and maternal risk of breast cancer | Future Oncology Free β-human chorionic gonadotropin, total human chorionic gonadotropin and maternal risk of breast cancer | Future Oncology](https://www.futuremedicine.com/cms/10.2217/fon.13.208/asset/images/medium/figure1.gif)
Free β-human chorionic gonadotropin, total human chorionic gonadotropin and maternal risk of breast cancer | Future Oncology
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IJERPH | Free Full-Text | First Trimester Combined Test (FTCT) as a Predictor of Gestational Diabetes Mellitus
![Full article: Significance of pregnancy test false negative results due to elevated levels of β-core fragment hCG Full article: Significance of pregnancy test false negative results due to elevated levels of β-core fragment hCG](https://www.tandfonline.com/cms/asset/33155e77-3795-48a8-9d2a-bc868ce110c1/ljii_a_1329152_f0001_oc.jpg)
Full article: Significance of pregnancy test false negative results due to elevated levels of β-core fragment hCG
![Table 2 from The clinical usefulness of biochemical (free β-hCg, PaPP-a) and ultrasound (nuchal translucency) parameters in prenatal screening of trisomy 21 in the first trimester of pregnancy. | Semantic Scholar Table 2 from The clinical usefulness of biochemical (free β-hCg, PaPP-a) and ultrasound (nuchal translucency) parameters in prenatal screening of trisomy 21 in the first trimester of pregnancy. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/df64feabd4c7afce8285ca4067ceaa0fef4aeb8e/5-Table2-1.png)
Table 2 from The clinical usefulness of biochemical (free β-hCg, PaPP-a) and ultrasound (nuchal translucency) parameters in prenatal screening of trisomy 21 in the first trimester of pregnancy. | Semantic Scholar
![The use of free β‐hCG in antenatal screening for Down's syndrome - Wald - 1993 - BJOG: An International Journal of Obstetrics & Gynaecology - Wiley Online Library The use of free β‐hCG in antenatal screening for Down's syndrome - Wald - 1993 - BJOG: An International Journal of Obstetrics & Gynaecology - Wiley Online Library](https://obgyn.onlinelibrary.wiley.com/cms/asset/197f9bc4-8548-4a1f-b0aa-7eb38f0da974/bjo_550_f1.gif)
The use of free β‐hCG in antenatal screening for Down's syndrome - Wald - 1993 - BJOG: An International Journal of Obstetrics & Gynaecology - Wiley Online Library
![Combined detection of α-fetoprotein and free β‑human chorionic gonadotropin in screening for trisomy 21 and management of cases in the moderate risk value range Combined detection of α-fetoprotein and free β‑human chorionic gonadotropin in screening for trisomy 21 and management of cases in the moderate risk value range](https://www.spandidos-publications.com/article_images/mco/7/4/mco-07-04-0623-g00.jpg)
Combined detection of α-fetoprotein and free β‑human chorionic gonadotropin in screening for trisomy 21 and management of cases in the moderate risk value range
![Performance characteristics of Elecsys free βhCG and PAPP-A for first trimester trisomy 21 risk assessment in gestational weeks 8+0 to 14+0 Performance characteristics of Elecsys free βhCG and PAPP-A for first trimester trisomy 21 risk assessment in gestational weeks 8+0 to 14+0](https://www.degruyter.com/document/doi/10.1515/labmed-2015-0084/asset/graphic/j_labmed-2015-0084_fig_001.jpg)
Performance characteristics of Elecsys free βhCG and PAPP-A for first trimester trisomy 21 risk assessment in gestational weeks 8+0 to 14+0
![First Trimester Maternal Serum Screening Using Biochemical Markers PAPP-A and Free β-hCG for Down Syndrome, Patau Syndrome and Edward Syndrome. - Abstract - Europe PMC First Trimester Maternal Serum Screening Using Biochemical Markers PAPP-A and Free β-hCG for Down Syndrome, Patau Syndrome and Edward Syndrome. - Abstract - Europe PMC](https://europepmc.org/articles/PMC3547446/bin/12291_2012_269_Fig6_HTML.jpg)
First Trimester Maternal Serum Screening Using Biochemical Markers PAPP-A and Free β-hCG for Down Syndrome, Patau Syndrome and Edward Syndrome. - Abstract - Europe PMC
![The use of free β‐hCG in antenatal screening for Down's syndrome - Wald - 1993 - BJOG: An International Journal of Obstetrics & Gynaecology - Wiley Online Library The use of free β‐hCG in antenatal screening for Down's syndrome - Wald - 1993 - BJOG: An International Journal of Obstetrics & Gynaecology - Wiley Online Library](https://obgyn.onlinelibrary.wiley.com/cms/asset/f2566e5c-e4ab-4f42-b9ef-58928949ea30/bjo_550_f2.gif)
The use of free β‐hCG in antenatal screening for Down's syndrome - Wald - 1993 - BJOG: An International Journal of Obstetrics & Gynaecology - Wiley Online Library
![PDF] Higher median levels of free beta-hCG and PAPP-A in the first trimester of pregnancy in a Chinese ethnic group. Implication for first trimester combined screening for Down's syndrome in the Chinese PDF] Higher median levels of free beta-hCG and PAPP-A in the first trimester of pregnancy in a Chinese ethnic group. Implication for first trimester combined screening for Down's syndrome in the Chinese](https://d3i71xaburhd42.cloudfront.net/43a0c847d11a6d25349fc9eb57caa4dca23324a5/2-Table1-1.png)