Final answer:
To noninvasively assess for magnesium sulfate toxicity, a 24-hour urine collection to measure urinary magnesium and other electrolytes can be conducted, paired with clinical observations.
Step-by-step explanation:
A noninvasive way to assess for magnesium sulfate toxicity includes a 24-hour urine collection to measure total daily urinary output and levels of magnesium, along with other electrolytes such as sodium, calcium, and phosphate. This method provides valuable information on the excretion of magnesium sulfate and can help in monitoring for signs of toxicity. It's important to couple these measurements with clinical observations such as changes in deep tendon reflexes, respiratory rate, and cardiac monitoring, as high magnesium levels can affect neuromuscular and cardiovascular systems.