A nurse is performing a nonstress test for a client who is at 38 weeks of gestation. The fetal monitor tracing reveals a series of late decelerations.
Which of the following interventions should the nurse implement first?

Choice A rationale

The lecithin/sphingomyelin (L/S) ratio test is a crucial assessment of fetal lung maturity. Lecithin and sphingomyelin are phospholipids that are components of surfactant, a substance vital for reducing surface tension in the alveoli and preventing lung collapse at birth. A ratio of 2: or greater generally indicates adequate lung maturity.

Choice B rationale

The L/S ratio test does not assess the baby's blood type. Fetal blood typing is determined through other methods, such as cordocentesis or maternal blood tests for fetal DNA, if clinically indicated. The L/S ratio specifically evaluates the quantity and ratio of pulmonary surfactants.

Choice C rationale

This test does not check the baby's liver development. Fetal liver development is assessed through different parameters, such as ultrasound visualization of liver size, blood flow characteristics, and specific liver enzyme levels if a concern exists. The L/S ratio is solely focused on pulmonary maturity.

Choice D rationale

The L/S ratio test is not used to check for genetic disorders. Genetic disorders are identified through chromosomal analysis, DNA sequencing, or biochemical tests performed on amniotic fluid cells obtained during amniocentesis, or through chorionic villus sampling. The L/S ratio is a physiological marker of lung readiness.

Choice A rationale: Ensuring suction is available is critical because clients with severe preeclampsia or eclampsia are at risk for seizures that can cause airway obstruction from secretions or vomiting. Suction readiness supports immediate airway management during a seizure, preventing aspiration and maintaining oxygenation, essential in protecting maternal and fetal health.

Choice B rationale: Administering 10 L of oxygen via nasal cannula is not appropriate because nasal cannulas typically deliver oxygen up to 6 L/min; higher flows require a different delivery system like a non-rebreather mask. Also, routine high-flow oxygen is not indicated unless hypoxia is present. The client’s oxygen saturation is normal (99%), so supplemental oxygen at this rate is unnecessary and could cause discomfort or drying of mucous membranes.

Choice C rationale: Raising side rails is a safety measure to prevent injury during seizures or sudden movements caused by central nervous system irritability in preeclampsia. Elevated side rails help protect the client from falls or trauma if a seizure occurs, an essential precaution in clients with neurological symptoms such as hyperreflexia and clonus.

Choice D rationale: Placing a padded tongue blade at the bedside prepares for seizure management by preventing tongue biting and airway obstruction. The padded blade reduces the risk of oral trauma during convulsions and maintains airway patency. However, it should be used carefully to avoid airway injury or obstruction and only if a seizure occurs.

Choice E rationale: Dimming lights reduces environmental stimuli that may exacerbate neurological irritability or trigger seizures in preeclampsia/eclampsia. Bright or flashing lights can increase CNS excitation, worsening headache, visual disturbances, or seizure risk. Creating a calm, low-stimulation environment helps stabilize the client’s neurological status.

Choice F rationale: Placing the client in the supine position is contraindicated because it compresses the inferior vena cava, reducing venous return and cardiac output, potentially worsening placental perfusion. The left lateral position is preferred in hypertensive pregnancy to optimize uteroplacental blood flow and maternal hemodynamics, improving fetal oxygenation and maternal comfort.