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CEN Practice Exam (Certified Emergency Nurse)

Category - Respiratory

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

5 mcg/ml
15 mcg/ml
25 mcg/ml
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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