undertaken to study the changes in variable parameters following corticosteroid therapy. Patients between 28 and 34 weeks of gestational age who were judged to be at risk for preterm labor were included. Patients with signs of active infection, multiple pregnancy were excluded. Inj. Betamethasone 12 mg within 24 hrs given NST and biophysical profile repeated on days 1, 2, 3. Blood sugars repeated on days 2, 4 and 6. Results and conclusion: Out of 220 patients included, loss of variability was seen more day 2 (60%) and it was more prominent in gestational age between 28 and 30 weeks and the same improved on day 3 (15%).