iWNH- Fetal Biometry
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NSW Health Biometry
There is no single set of charts that match the NSW population allowing comparison of all biometry (bi-parietal diameter (BPD), head circumference (HC), abdominal circumference (AC), femur length (FL) and estimated fetal weight (EFW).
Pregnancies should be dated based on a known Last Menstrual Period (LMP) or a first trimester (<14 weeks) ultrasound and dating should be confirmed at the morphology scan.
The formulas in
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should be used by all ultrasound providers in NSW.
Consider fetal growth restriction if any of the following are true.
A fetus with an EFW <10th centile
A fetus that appears asymmetrical with an AC <10th centile
A fetus with an EFW >10th centile that has a 50-centile reduction in EFW between two sets of measures four weeks apart




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