Nt scan reports comes all normal except nasal bone absent. Where all reports within normal range as below G age 12 weeks 2 days Fhr 161 BPM CRL 67.7 MM NT 1.90MM Tricuspid dropler- Normal Risk calculation given in report as below Trisomy 21 - Background risk 1 in 373 Adjusted risk 1 in 7468 Trisomy 18- Background risk 1 in 948 Adjusted Risk 1 in 16554 Trisomy 13- Background risk 1 in 2908 Adjusted Risk <1 in in 20000