Abstract: Colour Doppler ultrasound scan has a recognized place in evaluation of patients with ureteric calculi. The purpose of this study was to assess the ureteric jet characteristic variations according to size and site of ureteric calculi. This descriptive study was conducted using 83 patients with suspected calculus disease, aged 20-60years, who presented to genitourinary clinic, Teaching Hospital Peradeniya, Sri Lanka. All the patients underwent X-ray KUB and Colour Doppler Sonography with ureteral jet assessments, their S.Creatinine and UFR. Ultrasound KUB and Colour Doppler evaluation of ureteric jet was done by a radiologist as a non-variable single observer test. This study was conducted over one year period. As the results, there were 56.1% (N=46) subjects with right sided calculi and 43.9% (N=36) subjects with left sided calculi. There was no significant difference of stone sizes in relation to presence of ureteric jets (P = 0.619). Majority of calculi were impacted at VUJ. Mid ureteric calculi associated with highest percentage of absent ureteric jet and frequency of ureteric jet was significantly associated with the degree of obstruction.