Sonographic Evaluation of Nasal Bone in the First Trimester and the Biparietal Diameter to Nasal Bone Ratio

Purpose: To evaluate the length of a fetus's nasal bone using ultrasonography in order to detect aneuploidy.

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Evaluation

Are you examining a fetus during early pregnancy using ultrasonography?

Yes

Week of gestation

Are you able to visualize the region of the nasal bone?

Yes

Length of the nasal bone

2.5th percentile for nasal bone length at this gestational age

Biparietal diameter

Results

Please fill out required fields.

Results Interpretation and Description References Next Steps

Data complete?

Evaluation appropriate?

Biparietal diameter to nasal bone ratio

Number of findings suggesting aneuploidy

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Interpretation and Description

References

Next Steps in Evaluation

Diagnosis

Imaging Studies
- Sonographic Scoring Index of Benacerraf et al for Identifying an Autosomal Trisomy in a Second Trimester Fetus
- Revised Sonographic Scoring Index of Bromley et al for Detection of Down's Syndrome at 14-20 Weeks of Gestation
Severity, Prognosis, Stage
- Sonographic Scoring Index of Benacerraf et al for Identifying an Autosomal Trisomy in a Second Trimester Fetus
- Revised Sonographic Scoring Index of Bromley et al for Detection of Down's Syndrome at 14-20 Weeks of Gestation

Specialty

Obstetrics & Gynecology
Pedatrics
Genetics

Objective

imaging studies

ICD-10

Z34 - Supervision of normal pregnancy

Info

Purpose: To evaluate the length of a fetus's nasal bone using ultrasonography in order to detect aneuploidy.

Specialty: Obstetrics & Gynecology, Pedatrics, Genetics

Objective: imaging studies

ICD-10: Z34,

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