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Nine Months :The Chorionic villus sampling procedure

An ultrasound scan is done to check the position of the baby and the placenta.

Click here to see how an ultrasound scan is carried out.


While continuing to monitor the position through the scan, a fine needle is passed through the wall of the abdomen.
(Sometimes a fine tube may be passed through the vagina into the womb).


A sample of the chorionic tissue(fingers of tissue that form part of the placenta) is extracted through the needle or tube.


The chromosomes in the sample are studied to provide conclusive result


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