A chorion biopsy is the collection of villi from the chorionic area of the growing placenta. This type of biopsy should always be performed under ultrasound guidance, and may either performed transcervically or transabdominally using a catheter or a clamp appropriate to the gestational age.
The test must be performed after the 11th week of pregnancy to term. If the test if performed before the 10th week, it can lead ............................
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