NCLEX-RN Exam Practice

Category - Respiratory

Which of the laboratory results would indicate that a patient’s theophylline level is therapeutic?

  1. 5 mcg/ml
  2. 15 mcg/ml
  3. 25 mcg/ml
  4. 30 mcg/ml
Explanation

Answer: B - A therapeutic theophylline level is 15 mcg/ml. The normal range is 10 to 20 mcg/ml. Anything greater than 20 is considered toxic, meaning that the patient will start having side effects. Anything less than 10 indicates that the patient needs additional medication.

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