Background: The prevalence of lithiasis in the urinary tract is estimated at 12% of the general population in industrialized countries, of which 2.3% of the population that suffers it with a picture of renal colic. Radiological studies have been the tool used to establish the diagnosis of this pathology. The Gold Standard is computed tomography because it has a sensitivity of 96%-98% and a specificity of 95%-98%. We currently know that Ultrasound is a first-line tool and with technological advances has allowed us to identify almost all of this pathology, visualizing the renal anatomical alterations, ureters and the difference between the pathological and non-pathological bladder ureter jet. Material and methods: Analytical study, observations, prospective and correlation. The sample consists of patients older than 18 years who enter the emergency department of the Regional Hospital of Monterrey with the diagnosis of ureteral lithiasis, which has been performed Doppler Ultrasound and Computed Tomography, with entering the department of urology in the study period, and that meet the inclusion criteria in the period from March 2018 to November 2018. Results: Of the patients found, the majority were women, with 16 samples having an average of 72.7% of the general population. An almost similar relationship was found in the distribution of affected ureters, being mainly the right ureter. Discussion and conclusion: The use of Doppler ultrasound for the detection and measurement of Ureterovesical flow proved to be an effective method to correlate the size of the stone when it occurs in the uretero. Ultrasound has been placed as a form of current diagnosis for ureteral lithiasis, contrary to what was previously believed because the BMI, age and other factors affect the image at the time of diagnosing the lithium, but new forms have been found to relate this pathology as they are through the degree of hydronephrosis. It was shown that the larger the size of the stone, the lower the ureterovesical flow and vice versa the smaller the size of the stone, the greater the ureterovesical flow.