Can Biparietal Diameter (BPD) replace Crown-Rump length (CRL) for Gestational Age Estimation in the First Trimester, A Prospective Comparative study

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

TCTR

Registry ID

TCTR20260604010

Enrollment

169

Registered

2026-06-04

Start date

2025-11-17

Completion date

Unknown

Last updated

2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

pregnancy pregnancy Crown-Rump length Biparietal diameter estimated due date gestational age

Interventions

Singleton pregnancy that gestational age 11 0/7 to 13 6/7 weeks

Diagnostic

Pregnancy GA 11 to13 6/7 weeks

Eligibility

Sex/Gender

Female

Age

18 Years to No maximum

Inclusion criteria

Inclusion criteria: 1. pregnancy, 2. natural conceptions

Exclusion criteria

Exclusion criteria: 1. fetal structural abnormality, 2. fetal chromosome abnormality, 3. multiple pregnancy, 4. Ultrasound image was unclear; measurement could not be obtained

Design outcomes

Primary

Measure	Time frame
To compare the accuracy of gestational age estimation using BPD versus CRL against LMP-based gestational age At first trimester ultrasound Ultrasonography machine	—

Secondary

Measure	Time frame
To evaluate whether BPD can be used as an alternative to CRL for gestational age estimation according to ACOG criteria at first trimester ultrasound calculator	—

Countries

Thailand

Contacts

Public ContactNoochanart Pattanapanyasat

Queen Savang Vadhana Memorial Hospital

p3noochanart@gmail.com038320200

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 10, 2026