As per history given by you , your Double marker test is showing screen positive result. The risk for Down’s syndrome( Trisomy 21) has to confirmed by the invasive test like Amniocentesis.... U need to consult fetal medicine specialist! Take care

The NT measurement which you have told is lesser than the risk purchase 1.5 only so no need to worry about the NT measurement but the blood double marker along with NT scan comparison it says the risk ratio 1 : 2 17 which is actually little risky because those people who have lesser than 1 : 250 is considered high risk so you can either do a genetic screening or counselling with this or you can go for NIPT test which is less invasive or you can follow up with an anomaly scan as well but it is to be done under risk

Plz share the reports for better discussion

Information provided is inadequate for counseling you. All scan reports and blood test reports have to be reviewed before risk assessment is given.