11-13 week scan 11-13 week scan Nasal bone FMF Certificate of competence in the assessment of nasal bone In a high proportion of fetuses with trisomy 21 and other chromosomal abnormalities the nasal bone is hypoplastic or not visible at 11-13 weeks' gestation. Assessment of the nasal bone at 11-13 weeks improves the performance of screening for trisomy 21 by maternal age and fetal NT and serum biochemistry. Req.. 2014. 5. 27. 이전 1 다음