The diagnostic approach to PH is mainly focused on two tasks. The primary goal is to raise early suspicion of PH and ensure fast-track referral to PH centres in patients with a high likelihood of PAH, CTEPH, or other forms of severe PH. The second objective is to identify underlying diseases, especially LHD (group 2 PH) and lung disease (group 3 PH), as well as comorbidities, to ensure proper clas- sification, risk assessment, and treatment.