Maternity Nursing Q 55
A client at 36 weeks gestation is scheduled for a routine ultrasound prior to amniocentesis. After teaching the client about the purpose of the ultrasound, which of the following client statements would indicate to the nurse in charge that the client needs further instruction?
A. The ultrasound will help to locate the placenta.
B. The ultrasound identifies blood flow through the umbilical cord.
C. The test will determine where to insert the needle.
D. The ultrasound locates a pool of amniotic fluid.
Correct Answer: B. The ultrasound identifies blood flow through the umbilical cord.
Before amniocentesis, a routine ultrasound is valuable in locating the placenta, locating a pool of amniotic fluid, and showing the physician where to insert the needle. Color Doppler imaging ultrasonography identifies blood flow through the umbilical cord. A routine ultrasound does not accomplish this.
Option A: As early as 10 weeks, the placenta can be detected by an ultrasound. The normal placenta is discoid with uniform echogenicity and rounded margins. It is usually located along the anterior or posterior uterine walls, extending into the lateral walls.
Option C: Ultrasound is done before and during amniocentesis to ensure that the needle can safely pass through the walls of the abdomen and womb.
Option D: The sample of amniotic fluid is removed through a fine needle inserted into the uterus through the abdomen, under ultrasound guidance.