Asymptomatic bacteriuria in pregnancy can lead to complications like urinary tract infections (UTI), pyelonephritis, pre-eclampsia, toxaemia, low birth weight, intra uterine growth retardation, preterm labour, preterm premature rupture of membrane and post-partum endometritis. There is insufficiency of data regarding prevalence, causative organism and antibiotic sensitivity pattern in all three trimesters of pregnancy. Thus to prevent the complications screening for ASB has been suggested for all pregnant women attending antenatal clinics