GPT and COVID-19: Comparing clinical data from post-COVID-19 patients before and after the admission in a rehabilitation cycle, we detected dysregulation of parameters related to liver damage (AST and ALT), endovascular thrombotic processes (D-dimer), persisting pulmonary symptoms (CAT, Barthel, DLCO, SpO2, PaO2, FEV1, FVC, FEV1/FVC, FEV1%, FVC%), and physical impairment (6MWD).