First-trimester screening for Down syndrome; the role of nasal bone assessment in the Korean population

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Moon, Min Hoan; Cho, Jeong Yeon; Lee, Yu Mi; Jung, Sung Il; Yang, Jae Hyug; Kim, Moon Young; Ryu, Hyun-Mee; Chung, Jin Hoon; Park, Seong Ho
Issue Date
Prenat Diagn ;27: 830-834
Down Syndrome/*diagnosisFemaleHumansKoreaNasal Bone/*anatomy & histology/embryology/ultrasonographyPregnancy*Pregnancy Trimester, FirstProspective StudiesUltrasonography, Prenatal
OBJECTIVES: The aim of this study was to evaluate the role of nasal bone assessment in first-trimester screening for Down syndrome (DS) in the Korean population. METHODS: From July 2004 to March 2006, we prospectively evaluated the fetal nasal bones at 11-14 weeks' gestation in the Korean population. RESULTS: A successful evaluation was possible in 6490 of 6787 fetuses (95.6%). Absent, hypoechoic, and short nasal bones were seen in 4 (26.7%), 4 (26.7%), and 1 (6.7%) of 15 fetuses with DS, respectively, whereas in 5 (0.1%), 11 (0.2%), and 246 (3.8%) of 6456 normal fetuses. The incidence of absent and hypoechoic nasal bone showed significant differences between normal fetuses and fetuses with DS (P < 0.0005, both). Screening for DS using an absent or hypoechoic nasal bone resulted in a sensitivity of 53.3%, a specificity of 99.8%, a positive likelihood ratio of 215.2, and a negative likelihood ratio of 0.5. CONCLUSION: Our study showed that nasal bone abnormality at 11-14 weeks of gestation had a high association with DS in the Korean population. This suggests that nasal bone assessment can be used to supplement the current first-trimester screening for DS in the Korean population.
0197-3851 (Print)
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Radiation Applied Life Science (대학원 협동과정 방사선응용생명과학전공)Journal Papers (저널논문_방사선응용생명과학)
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