Comparison of two office tests for determining blood theophylline levels

The blood theophylline level determination is an important therapeutic tool, but reference laboratories can take from 1 to 3 days before giving results. Several quicker in-office methods for testing blood theophylline levels are currently available. Two methods were compared for reliability and accuracy. Both proved to be accurate, but the Acculevel method was more reliable than the Seralyzer method. The Acculevel appears to be a preferable method for in-office testing of serum theophylline levels.