How accurate are 21 week scan measurements?
BPD measures 4.48cm which is <2% percentile - measuring 19weeks
But his HC is 17.5cm 46% percentile - measuring 20w6d
BPD = Bi Parietal Diameter. HC = Head Circumference
Cerebellum 2.11cm 32% percentile - measuring 21w2d
AC is 17.1cm 76% percentile - measuring 21w5d
But he also has very long legs apparently! FL is 3.87cm >90% percentile measuring 22w3d
Mostly concerned about the BPD but I thought if that was small the HC would be small?
Thanks in advance for any info!
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