The sampling process for either procedure takes around 1 minute
For both procedures, an ultrasound examination will first be done to detect the placenta (for CVS) or the best site for sampling (amniocentesis). During CVS, local anaesthesia will be injected. Local anaesthesia is generally not needed for amniocentesis.
For both procedures, a fine needle is used to extract the needed sample. The sampling process for either procedure takes around 1 minute.
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