This report summarizes the results of a study of uranium levels in urine from Swedish personnel serving in Kosovo during autumn 2000 and spring 2001 (KS03). The exchange battalion (KS04), i.e. personnel that has not yet been to Kosovo, has been used as a control group in the study. Daily urine was collected from the persons chosen for the study and the levels of uranium and creatinine were determined. The results show significantly lower levels of uranium in urine for the Kosovo group compared to the Swedish group. The mean value of the Kosovo group is 6.9 ng U/g creatinine and 26.8 ng U/g creatinine for the Swedish group.