NT SCREENING (11–13 WEEKS 6 DAYS)
BASIC REQUIREMENTS (QUALITY CRITERIA)
๐ CRL between 45–84 mm
๐ Mid-sagittal Plane Obtained
๐ Neutral Fetal Position
๐ Clear Differentiation of Amnion
๐ Proper Caliper Placement (Inner–Inner)
NORMAL NT FINDINGS
๐ NT within Normal Range (<95th Percentile)
๐ Nasal Bone Present
๐ Normal Ductus Venosus Flow
๐ No Tricuspid Regurgitation
๐ Normal Frontomaxillary Facial Angle
INCREASED NUCHAL TRANSLUCENCY
๐ Mildly Increased NT (95–99th Percentile)
๐ Markedly Increased NT (≥99th Percentile)
๐ Septated NT / Early Cystic Hygroma
SOFT MARKERS FOR ANEUPLOIDY
๐ Absent / Hypoplastic Nasal Bone
๐ Abnormal Ductus Venosus (Absent / Reversed a-wave)
๐ Tricuspid Regurgitation (>60 cm/s)
๐ Increased Frontomaxillary Facial Angle
ANEUPLOIDY RISK ASSOCIATION
๐ Increased Risk for Trisomy 21 (Down Syndrome)
๐ Increased Risk for Trisomy 18
๐ Increased Risk for Trisomy 13
๐ Turner Syndrome (45,X)
STRUCTURAL & GENETIC RISK ASSOCIATION
๐ Increased NT with Normal Karyotype
๐ Risk of Congenital Heart Disease
๐ Risk of Genetic / Syndromic Disorder
NT ASSESSMENT IN MULTIPLE PREGNANCY
๐ NT Measurement in Dichorionic Twins
๐ NT Discordance Between Twins
๐ Increased NT in One Twin
๐ Early Marker of TTTS (NT Discordance)
COMBINED FIRST TRIMESTER SCREEN
๐ NT + Maternal Age
๐ NT + Biochemistry (PAPP-A, ฮฒ-hCG)
๐ High-Risk Screening Result
๐ Low-Risk Screening Result
FOLLOW-UP & RECOMMENDATIONS
๐ Genetic Counseling Advised
๐ NIPT Recommended
๐ CVS / Amniocentesis Advised
๐ Early Fetal Echocardiography Planned
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