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In medicine, a double X generally refers to the female gene; girls receive an X chromosome from both mother and father. An XY world refer to the male, because boys receive an X chromosome from the mother and a Y chromosome from the father.

However, if you do not understand the notations on any medical document, particularly a pregnancy scan, you should contact your medical provider - perhaps the nurse at the clinic where the scan was taken - to ask about what it means.

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15y ago

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