Portal Hypertension (PHT) is a vascular syndrome defined by an increase in the pressure gradient greater than 5 mmHg between the portal vein and the inferior vena cava, which is accompanied from the clinical point of view with splenomegaly, gastrointestinal varices, ascites and liver failure. The use of Doppler ultrasound is today a routine study in the evaluation of Portal Hypertension because it offers anatomical and functional information of the spleno-portal axis as well as related underlying organs, such as the liver, spleen, pancreas and the abdominal cavity. The objective of the study is to determine the existence of PHT, its etiology and making the diagnosis of associated complications. Derivative shunts can also be evaluated by this method, as well as the response to pharmacological treatment such as beta blockers or mononitrates. The diameter of the portal vein should not exceed 13 mm, although in some patients it can reach 16 mm in deep inspiration. The evaluation with Doppler allows to obtain qualitative data (presence or absence of flow), semi-quantitative data (measurement of pulsatility and resistance indices) and quantitative data (measurement of velocities and volume of flow). With the Doppler signal the splenic-portal confluence, mesenteric veins and splenic vein, as well as the hepatic artery are assessed. The flow of the portal vein and the hepatic artery have the same orientation towards the liver and the suprahepatic veins present a direction away from this organ, therefore in normal patients, with the Doppler signal the color coding will be similar in the porta and hepatic artery and opposite to the coding of the suprahepatic veins, regardless of how the color-coding bar is oriented. Diagnosis is made by demonstrating a decrease in the Mean Velocity of less than 12 cm/s or inversion of the orientation of the flow with angle correction of 60 degrees or less, presence of extrahepatic collateral circulation, decrease in the Hepatic Vascular Index below 12, increase of the Congestion Index greater than 0.12, increase in the PI of the hepatic artery greater than 1.1 The combination of these parameters offers a sensitivity and specificity of 95%.