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Commonly, pulmonary hypertension is clinically suspected because of unexplained exertional dyspnoea or as a chance finding in clinical examination revealing signs of right heart failure. The systematic diagnostic approach and exact classification is based on the Venice classification. Basic investigations include ECG, chest radiograph, lung function studies and echocardiography. Echocardiography is the most important investigation for the diagnosis of pulmonary hypertension. It also serves as non invasive control during treatment and as the main screening test for pulmonary hypertension. Echocardiographic criteria of pulmonary hypertension are a dilated and hypertrophied right ventricle, paradoxic septum movement, a dilated right atrium, and a distended inferior Vena cava. Using Doppler echocardiography, the right ventricular and thus pulmonary arterial systolic pressure can be determined from the tricuspid regurgitant jet velocity. CT of the chest serves to exclude pulmonary embolism and interstitial lung disorders. Cardiac MRI is increasingly being used for analysis of right ventricular morphology, function and haemdynamics. The 6 minute walk test and cardiopulmonary exercise test are used to assess severity and response to treatment and give prognostic information. For the definite diagnosis of pulmonary hypertension, right heart catheterisation is required for the determination of the pulmonary vascular resistance and pharmacological testing of "reversibility".