Double Marker (Maternal Serum Screening) Test
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Use: Screens first-trimester pregnancy (11–14 weeks) for chromosomal abnormalities like Down Syndrome (Trisomy 21) and Edward Syndrome.
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Details: Quantitative blood test measuring Free Beta-HCG and PAPP-A combined with fetal NT ultrasound parameters.
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Preparation: Fasting NOT required; doctor’s prescription and accurate ultrasound (NT scan) report required before sample collection.
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