Nuchal Translucency

First trimester screening. NT measurement and risk.

Fetal Biometry

Crl

Age

NT Result

NT Value1.8mmActual

Screen StageLower Risk / Normal

The measurement is within the expected range for this gestational age.

Clinical Interpretation

Screening Thresholds

Normal< 2.5 mm

Increased2.5 - 3.4 mm

Abnormal≥ 3.5 mm

Disclaimer: This tool is for informational purposes only and is not a substitute for professional medical advice.

About this calculator

Overview

NT is fluid behind fetal neck at 11–14 weeks. Increased NT associated with chromosomal abnormalities, cardiac defects. Combined with serum for risk.

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Pro Tips

Fun Facts

Formula: MoM = Measured NT / Expected NT for CRL. Risk from combined test.