My wife age 32 is 12 weeks
pregnant, NT can done at 12weeks shows NT 1mm, nasal bone present 1.8 mm, CRL 52mm, FRH 174/min other studies related to uterine blood flow are normal.On Dual marker test Free
beta HCG is 140 ng/ml, Papp is 1.39 miu/ml. Biochemical risk for Trisomy 21 is shown high 1/15 however combined risk( NT+ BC+DM) is low 1/3038. Kindly advised how should we go ahead. Also what may be the cause for raised free B hcg. She is on tab duphaston 10 mg twice a day.