In managing a preterm labor patient receiving magnesium sulfate, which element is most important to include in the plan of care?

• A. Monitor levels of magnesium in the blood
• B. Monitor fetal heart rate for reduced variability
• C. Assess for sedation and decreased level of consciousness
• D. Monitor urine output

Answer: (A)

The key idea here is safety and dosing control for magnesium sulfate therapy. When a preterm labor patient is receiving magnesium sulfate, the most important plan element is regularly checking the mother’s serum magnesium level. Keeping the level within the therapeutic range ensures the drug can continue to prevent contractions and provide fetal neuroprotection, while minimizing the risk of toxicity. Measuring the serum level gives a precise, objective guide for adjusting the infusion rate or dose, which is essential because magnesium can accumulate and lead to serious complications if levels rise too high.

Other monitoring tasks—like tracking fetal heart rate patterns, watching for sedation or decreased level of consciousness, or checking urine output—are important components of comprehensive care, but they do not tell you as directly whether the mother’s magnesium exposure remains safe or therapeutic.