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Cell-free DNA screening has transformed prenatal screening for common fetal aneuploidies because of its high sensitivity, particularly for trisomy 21. Meta-analyses and prospective studies show substantially higher detection rates and lower false-positive rates than traditional serum screening for several common chromosomal conditions. For clinicians, the important point is that cell-free DNA is a screening test, not a diagnostic test. Positive results require genetic counseling and confirmation with invasive diagnostic testing such as chorionic-villus sampling or amniocentesis before irreversible decisions. The pretest probability also affects positive predictive value, so counseling should incorporate maternal age, ultrasound findings and the screened condition. In twin or atypical pregnancies, test performance can differ and specialist input becomes particularly important. NIPT therefore fits best into a structured prenatal pathway combining informed consent, ultrasound assessment, screening interpretation and access to diagnostic testing.
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Cell-free DNA screening has transformed prenatal screening for common fetal aneuploidies because of its high sensitivity, particularly for trisomy 21. Meta-analyses and prospective studies show substantially higher detection rates and lower false-positive rates than traditional serum screening for several common chromosomal conditions. For clinicians, the important point is that cell-free DNA is a screening test, not a diagnostic test. Positive results require genetic counseling and confirmation with invasive diagnostic testing such as chorionic-villus sampling or amniocentesis before irreversible decisions. The pretest probability also affects positive predictive value, so counseling should incorporate maternal age, ultrasound findings and the screened condition. In twin or atypical pregnancies, test performance can differ and specialist input becomes particularly important. NIPT therefore fits best into a structured prenatal pathway combining informed consent, ultrasound assessment, screening interpretation and access to diagnostic testing.
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