Serum/saliva correlations for theophylline in asthmatics

J. Blanchard, S. Harvey, W. J. Morgan

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Theophylline levels in mixed saliva (both stimulated and unstimulated) were compared with total and free (unbound) serum theophylline levels in 28 asthmatic outpatients using theophylline regularly. Stimulated saliva predicted both total and unbound serum theophylline concentrations within ± 1 μg/mL in 62.5% and 92.9%, respectively, of the samples examined. In addition, the total serum levels could be used to predict unbound serum concentrations to within ± 1 mg/L in 100% of the cases that were examined. These results indicate that saliva levels predict the unbound serum theophylline levels with greater accuracy and precision than they predict total serum theophylline levels. In addition, total serum levels can be used to reliably predict unbound serum levels. The use of mixed stimulated saliva is recommended as a reliable non-invasive method for monitoring unbound serum theophylline levels. The therapeutic range for saliva, which corresponds to the accepted total serum concentration range of 10-20 mg/L, is approximately 5.6-11.3 mg/L.

Original languageEnglish (US)
Pages (from-to)565-570
Number of pages6
JournalJournal of clinical pharmacology
Issue number6
StatePublished - 1991

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)


Dive into the research topics of 'Serum/saliva correlations for theophylline in asthmatics'. Together they form a unique fingerprint.

Cite this