Skip to main content


Alias: Aminophylline Nuelin SA Phyllocontin Continus Slo-Phyllin Uniphyllin Continus

Discipline: Clinical Chemistry

Test information: Theophylline is a methylxanthine derivative which is widely used in the treatment of asthma, obstructive lung disease and neonatal apnoea. The primary therapeutic effect of Theophylline is due to relaxation of bronchial smooth muscle; however, theophylline has a variety of other effects. 

Specimen Type(s)
  • Blood;
Other Acceptable Specimen Type(s)
Specimen Container - Adult
  • Gold Top SST BD;
Specimen Container - Paediatric
  • Light Green Top Microtainer BD;
  • N/A;
Part of a test profile?
Volume (min) of sample to be sent to laboratory
Patient Preparation, Sample Handling and Transport
BNF States: Measure 5 days after starting oral treatment.
At least 3 days after any dose adjustment.
Blood sample should usually taken 4–6 hours after an oral dose of a modified-release preparation (sampling times may vary—consult local guidelines).
Maximum add on time
5 days
Units and Reference Ranges / Interpretation
10 - 20 mg/L
UKAS number
UKAS accredited test?

If you have any queries about a test or results interpretation please contact us.

Last updated: 03-05-2024