Are you referring to the nuchal fold scan, or are you referring to amniocentesis or CVS?
The nuchal fold scan is like a normal u/s scan and is usually done in conjunction with some blood tests. Most people don't routinely have amniocentesis or CVS done unless the first nuchal fold scan and blood tests indicate that there may be a problem, and even then, it's not essential for you to have these additional tests done if you don't want to - it's a personal choice.
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