Start ➔ First Trimester USG (11–13+6 weeks)
Confirm:
- Crown-Rump Length (CRL) between 45–84 mm
- Fetal viability confirmed
- Crown-Rump Length (CRL) between 45–84 mm
- Fetal viability confirmed
Measure:
- Nuchal Translucency (NT)
- Use mid-sagittal view
- Fetal neck in neutral position
- Nuchal Translucency (NT)
- Use mid-sagittal view
- Fetal neck in neutral position
Evaluate NT Result:
➔ NT < 95th percentile ➔ Routine follow-up
➔ NT ≥ 95th percentile (or ≥ 3.5 mm) ➔ HIGH RISK: NIPT / Invasive Testing / Detailed Scan / Echo
➔ NT < 95th percentile ➔ Routine follow-up
➔ NT ≥ 95th percentile (or ≥ 3.5 mm) ➔ HIGH RISK: NIPT / Invasive Testing / Detailed Scan / Echo
Combine with:
- Maternal Age
- Serum Markers (free β-hCG + PAPP-A)
- Maternal Age
- Serum Markers (free β-hCG + PAPP-A)
Risk Assessment:
➔ Low Risk ➔ Reassure, Routine Care
➔ High Risk ➔ Genetic Counseling + Diagnostic Testing
➔ Low Risk ➔ Reassure, Routine Care
➔ High Risk ➔ Genetic Counseling + Diagnostic Testing
Visual Summary
| Step | Action |
|---|---|
| Step-1 | Confirm CRL + Viability |
| Step-2 | Measure NT Accurately |
| Step-3 | Assess NT Thickness |
| Step-4 | Combine with Maternal Serum Markers |
| Step-5 | Calculate Risk (High or Low) |
| Step-6 | Advise NIPT or Invasive Testing if High Risk |
Quick Pearls:
- NT > 3.5mm needs further evaluation.
- Cystic hygroma = much higher risk.
- Normal NT reduces, but doesn't eliminate all risks.
- Combine with Double Marker test for best accuracy!
- NT > 3.5mm needs further evaluation.
- Cystic hygroma = much higher risk.
- Normal NT reduces, but doesn't eliminate all risks.
- Combine with Double Marker test for best accuracy!
No comments:
Post a Comment