What it means
A diagnostic test usually done at about 10 to 13 weeks of pregnancy, earlier than amniocentesis. A thin tube is passed through the cervix, or a needle through the abdomen, guided by ultrasoundUL-truh-sowndAn imaging test that uses high-frequency sound waves to make pictures of the inside of the body.ultra- beyond, more thansound sound wavesFull entry , to remove a few chorionic villi, tiny projections of the placenta that share the baby's genetic makeup. It can diagnose conditions such as Down syndrome and other trisomies. It carries a small risk of miscarriage.
For the nurse
Make sure the client understands the test and has signed consent. Afterward, teach them to report bleeding, fluid leaking, fever or cramping. A client who is Rh-negative receives Rho(D) immune globulin after the test.
At a glance
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Related terms
ultrasound
An imaging test that uses high-frequency sound waves to make pictures of the inside of the body.
amniocentesis
A test in which a needle is put through the belly into the uterus to take a sample of amniotic fluid.
trisomy
Having three copies of a chromosome instead of the usual two.
Rho(D) immune globulin
An injection of antibodies given to an Rh-negative person to stop their body from making antibodies against Rh-positive blood.