A nurse is caring for a client who is at 37 weeks of gestation and reports a slow trickle of vaginal fluid for the past 12 hours.
Which of the following diagnostic tests should the nurse anticipate?
Speculum exam to test for fetal fibronectin.
Vaginal swab for nitrazine testing.
Urinalysis to determine protein content.
Amniocentesis to determine fetal lung maturity.
The Correct Answer is B
Choice A rationale
A speculum exam to test for fetal fibronectin is primarily used to predict the risk of preterm labor in symptomatic women between 22 and 34 weeks of gestation. Since the client is at 37 weeks of gestation (term) and the concern is a slow trickle of fluid suggesting rupture of membranes (ROM), this test is not appropriate for the current clinical presentation or gestational age.
Choice B rationale
Nitrazine testing is a rapid, non-invasive method used to determine if the fluid leaking from the vagina is amniotic fluid. Amniotic fluid is alkaline (pH of 7.0 to 7.5) and will turn the yellow-to-orange nitrazine paper to a characteristic deep blue color, which helps confirm the diagnosis of premature rupture of membranes (PROM), a likely cause of the reported fluid trickle.
Choice C rationale
A urinalysis determines components like protein, glucose, and ketones, and is mainly used to screen for conditions such as preeclampsia (indicated by proteinuria) or urinary tract infection (UTI). While part of routine prenatal care, it is not the diagnostic test for confirming ruptured membranes, which is the primary concern given the client's report of a slow trickle of vaginal fluid.
Choice D rationale
Amniocentesis is an invasive procedure used to aspirate amniotic fluid, typically to assess fetal lung maturity (L/S ratio) or for genetic testing. Since the client is at 37 weeks and the suspicion is ruptured membranes, which warrants immediate action due to infection risk, the risks and benefits of an amniocentesis for lung maturity are not justified.
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Naxlex Comprehensive Predictor Exams
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Correct Answer is C
Explanation
Choice A rationale
A transvaginal fetal Doppler probe is an internal device used early in pregnancy to confirm fetal viability or heart rate in the first trimester, not an appropriate method for continuous intrapartum monitoring in a full-term client with intact membranes.
Choice B rationale
The DeLee-Hillis fetoscope is an external acoustic device used for intermittent auscultation of the fetal heart rate, providing a listening assessment rather than the prescribed continuous electronic tracing required for this client.
Choice C rationale
An external ultrasound transducer monitor (or tocodynamometer for contractions) uses non-invasive Doppler technology placed on the client's abdomen to detect and continuously monitor the fetal heart rate and uterine contractions when membranes are intact, satisfying the continuous monitoring prescription without internal access.
Choice D rationale
An internal fetal scalp electrode (FSE) requires the rupture of membranes and sufficient cervical dilation for placement onto the fetal scalp to provide a precise electrocardiogram of the fetal heart, which is not applicable since the client's membranes are intact.
Correct Answer is C
Explanation
Choice A rationale
Acyclovir is an antiviral medication used primarily to treat herpes simplex virus (HSV) infections to prevent vertical transmission to the neonate. Group B Streptococcus (GBS) is a bacterium and is treated with antibiotics, specifically penicillin or ampicillin, administered intravenously during labor and delivery to prevent neonatal sepsis.
Choice B rationale
The Group B Streptococcus (GBS) culture is typically collected as a single screen between 36 weeks 0 days and 37 weeks 6 days of gestation from the lower vagina and perirectal area. This one-time positive result is sufficient to indicate the need for intrapartum antibiotic prophylaxis (IAP); repeat testing 24 hours later is not standard practice.
Choice C rationale
If the Group B Streptococcus (GBS) culture is positive, the client is considered colonized and requires intrapartum antibiotic prophylaxis (IAP), usually penicillin G, administered intravenously at the onset of labor or rupture of membranes. This reduces the risk of GBS transmission to the newborn, which can cause severe neonatal morbidity like sepsis or pneumonia.
Choice D rationale
The Group B Streptococcus (GBS) culture is a screening test obtained via a swab of the client's lower vagina and perirectal area, not a blood test. The GBS bacteria colonize these areas, and the swab is sent for culture and sensitivity to determine the need for prophylactic antibiotics during labor.
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