The risk for delivering a baby with birth weight above the 90th centile for gestational age is provided by a combination of maternal characteristics, fetal nuchal translucency thickness and maternal serum free ß-hCG and PAPP-A .

It is strongly recommended that those undertaking assessment of risk receive the Fetal Medicine Foundation Certificate of competence in the 11-13 weeks scan (see FMF Certificates of Competence).

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