SATURN STILLS / SCIENCE PHOTO LIBRARY SATURN STILLS / SCIENCE PHOTO LIBRARY
Amniocentesis test in pregnancy. This test is performed on pregnant women. First an ultrasound transducer is used to determine the best location for extraction. A needle is then inserted through the woman's abdomen into the amniotic sac surrounding the foetus. A sample of the amniotic fluid is extracted and then screened for genetic or chromosomal disorders, such as Down's syndrome.
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