Which of the following measures are used to calculate serum osmolality?
  1. Sodium, chloride, and glucose
  2. Sodium, potassium, and magnesium
  3. Sodium, lactic acid, and glutamine
  4. Sodium, glucose, and BUN
Explanation
Answer: D - Sodium, glucose, and BUN are used to calculate serum osmolality, which is a measure of osmotically active particles in the blood. Normal serum osmolality is about 300 mEq/liter.
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