A nurse is caring for a client who has consented to an amniocentesis for genetic cell analysis. The client asks why she can’t have the test before 14 weeks of gestation.
Which of the following responses should the nurse make?
The fetus is not mature enough until this time.
This is when the heartbeat is first audible.
There is not enough amniotic fluid until this time.
The genetic results will not be accurate until this time.
The genetic results will not be accurate until this time.
The Correct Answer is C
Choice A:
While fetal maturity is a factor in the timing of amniocentesis, it's not the primary reason for waiting until 14 weeks.
Earlier in pregnancy, fetal cells are less abundant in the amniotic fluid, making it more challenging to obtain a sufficient sample for accurate testing.
Additionally, the procedure carries a slightly higher risk of miscarriage before 14 weeks.
Choice B:
The audibility of the fetal heartbeat is not directly related to the timing of amniocentesis.
It's typically possible to hear the heartbeat by Doppler ultrasound around 10-12 weeks, but this doesn't mean there's enough amniotic fluid for amniocentesis.
Choice D:
The accuracy of genetic results is not dependent on the timing of amniocentesis after 14 weeks.
As long as a sufficient sample of amniotic fluid is obtained, the accuracy of the results is not affected by gestational age.
Choice C:
The most accurate explanation for why amniocentesis is not performed before 14 weeks is the amount of amniotic fluid. Before 14 weeks, there's typically not enough amniotic fluid to safely extract a sample without potentially harming the fetus or the placenta.
By 14 weeks, there's usually enough fluid to adequately cushion the fetus and the needle during the procedure, reducing the risks involved.
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Related Questions
Correct Answer is B
Explanation
Choice A:
Mood swings are a common and expected symptom of early pregnancy due to hormonal changes. They typically do not require medical attention unless they become severe or interfere with daily life.
While it's important to discuss mood swings with a healthcare provider, they are not considered a critical symptom that necessitates immediate action.
Choice C:
Urinary frequency, or the need to urinate more often, is also a common symptom of early pregnancy. It's caused by hormonal changes and the growing uterus putting pressure on the bladder.
While it can be inconvenient, it's typically not a cause for concern unless accompanied by other symptoms, such as pain or burning during urination.
Choice D:
Decreased energy, or fatigue, is another common and expected symptom of early pregnancy.
It's often caused by hormonal changes and the body's increased workload to support the growing fetus.
While it can be frustrating, it's typically not a cause for concern unless it becomes severe or interferes with daily life.
Choice B:
Facial edema, or swelling of the face, is not a common symptom of early pregnancy.
It can be a sign of preeclampsia, a serious pregnancy complication characterized by high blood pressure and protein in the urine.
Preeclampsia can develop suddenly and progress quickly, so it's important to seek medical attention right away if facial edema occurs.
Key Points:
Facial edema is a potential sign of preeclampsia, a serious pregnancy complication.
Mood swings, urinary frequency, and decreased energy are common and expected symptoms of early pregnancy that typically do not require immediate medical attention.
It's important for pregnant women to be aware of potential warning signs and to seek medical advice promptly if they experience any concerning symptoms.
Correct Answer is ["B","C","E"]
Explanation
Choice A:
Rh incompatibility is not directly identified through amniocentesis. Instead, it's typically assessed through blood tests that determine a woman's Rh factor and screen for Rh antibodies.
However, amniocentesis can provide information that might be relevant to Rh incompatibility, such as the fetal Rh type. If the mother is Rh-negative and the fetus is Rh-positive, there's a risk of Rh incompatibility.
Choice B:
Amniocentesis can detect neural tube defects (NTDs) like spina bifida and anencephaly.
It does this by measuring the levels of alpha-fetoprotein (AFP) in the amniotic fluid. AFP is a protein produced by the fetal liver, and elevated levels in the amniotic fluid can indicate an NTD.
Choice C:
Amniocentesis can accurately determine the fetal gender by examining the sex chromosomes present in the cells of the amniotic fluid.
Choice D:
Cephalopelvic disproportion (CPD) is a condition where the baby's head is too large to fit through the mother's pelvis. It's not diagnosed through amniocentesis.
CPD is usually suspected based on clinical findings like a slow progression of labor or a high fetal station, and it might be confirmed with imaging techniques like X-ray or ultrasound.
Choice E:
Amniocentesis is a valuable tool for diagnosing chromosomal defects, such as Down syndrome, Trisomy 18, and Trisomy 13. It does this by analyzing the chromosomes of the fetal cells present in the amniotic fluid.
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