A nurse is performing an abdominal ultrasound for a client who is at 28 weeks of gestation.

The nurse should instruct the client to do which of the following before the procedure?

. The client’s cervix is dilated.

This indicates that the client may be in preterm labor, which is a contraindication for amniocentesis.

Amniocentesis is a procedure that involves inserting a needle into the amniotic sac to obtain a sample of amniotic fluid for genetic testing or other purposes.

It is usually performed between 15 and 20 weeks of gestation.

Choice A is wrong because the client’s bladder should be full for amniocentesis.

This helps to push the uterus upward and away from the bladder, reducing the risk of injury and making it easier to visualize the fetus and the needle.

Choice B is wrong because the client’s uterus should be above the symphysis pubis at 16 weeks of gestation.

This is a normal finding and does not affect the procedure.

Choice D is wrong because the client’s fundal height should measure around 16 cm at 16 weeks of gestation.

A fundal height of 20 cm may indicate a large for gestational age fetus, multiple gestation, or polyhydramnios (excess amniotic fluid), but these are not absolute contraindications for amniocentesis.

However, they may require further evaluation and adjustment of the technique.

Choice A is wrong because it describes a transabdominal CVS procedure, which involves a needle instead of a catheter.

Choice C is wrong because it describes a procedure that is not used for CVS.A needle inserted through the cervix could damage the fetal membranes or cause bleeding.

Choice D is wrong because it describes a procedure that is not possible.A catheter cannot be inserted through the abdomen and uterus into the placenta.

Normal ranges for CVS are not applicable as it is a diagnostic test, not a screening test.

It provides a definitive result of whether the fetus has a chromosomal abnormality or a genetic disorder.CVS is usually done between 10 and 13+6 weeks of pregnancy.