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HC/FL Ratio - 4.62 @ 10% at 30 week growth scan

Hi, can you tell me how the HC/FL ratio is determined? Mine is showing a HC of 28.1cm (14%) and a FL of 6.09cm, yet the ratio is at 10% when both those numbers on their own seem to be in good standing. Both had GA's of 30w 6d and 31w 4d. Do I need to be concerned about these numbers?
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