Nopr, it's just by scanning - they take some measurements of your uterus and do some calculations.
IN the UK this gets done as part of our 20 week scan (anomoly scan) - I'm not sure why they would do a spearate AFI scan, unless yours was low or high at a previous scan?
If you were having needle and taking fluid out, then that would be amniocentesis, but I think they would have to talk that through with you, it's not a routine test and that's to check for things in the water, which tell you if there are things like downs etc...
But if they've said it's an AFI check, that's done by scan (sonographer).
Any opinions, advice, statements or other information expressed or made available on BabyandBump.Momtastic.com by users or third parties, including but not limited to bloggers, are solely those of the respective user or other third party. They do not reflect the opinions of BabyandBump.Momtastic.com and they have not been reviewed by a physician, psychologist or parenting expert or any member of the BabyandBump.Momtastic.com staff for accuracy, balance or objectivity. Content and other information presented on BabyandBump.Momtastic.com are not a substitute for professional medical or mental health advice, counseling, diagnosis, or treatment. Never delay or disregard seeking professional medical or mental health advice from your physician or other qualified health provider because of something you have read on BabyandBump.Momtastic.com. BabyandBump.Momtastic.com does not endorse any opinion, advice, statement, product, service or treatment made available on the website. If you think you have a medical emergency, call your doctor or emergency services immediately.