A study has been done on the theophylline serum levels and pulmonary function tests, comparising FVC, FEV1 and PEFR, on 21 patients with status asthmaticus, age 15 to 50 years, admitted in the Intensive Care Unit, Pulmonary Department Dr. Soetomo General Hospital Surabaya and treated with the standard protocol. Theophyllines serum levels and pulmonary functions test were measured immedistely af…