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Which assessment in a patient diagnosed with preeclampsia who is taking magnesium sulfate would indicate a therapeutic level of medication?

  • A. Drowsiness
  • B. Urinary output of 20 mL/hour
  • C. Normal deep tendon reflexes
  • D. Respiratory rate of 10 to 12 breaths per minute
Correct Answer: C

Rationale: The correct answer is C: Normal deep tendon reflexes. This indicates a therapeutic level of magnesium sulfate as it shows that the medication is effectively preventing hyperreflexia, a common sign of magnesium toxicity. Drowsiness (choice A) can indicate toxicity. Urinary output of 20 mL/hour (choice B) is not specific to magnesium sulfate levels. Respiratory rate of 10 to 12 breaths per minute (choice D) is indicative of respiratory depression, a sign of magnesium toxicity. Thus, choice C is the best assessment to indicate a therapeutic level of medication in a patient with preeclampsia taking magnesium sulfate.