When should serum theophylline be measured in patients with suspected status asthmaticus?

Updated: Jun 17, 2020
  • Author: Constantine K Saadeh, MD; Chief Editor: John J Oppenheimer, MD  more...
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Answer

If the patient has been receiving theophylline at home, obtain a serum theophylline level before therapy. Following a loading dose (if needed), obtain a serum level 30 minutes after the end of the infusion. For serum theophylline steady-state levels, obtain a serum sample at 24-36 hours in children younger than 6 months, at 12-24 hours for those aged 6 months to 12 years, and at 24 hours for children aged 12 years and older.


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