GPT and pulmonary arterial hypertension: For instance, Yogeswaran et al studied readily and routinely available laboratory parameters in PAH and chronic thromboembolic PH, and found that a score derived from γ-glutamyltransferase, aspartate aminotransferase/alanine aminotransferase ratio, and the neutrophil-to-lymphocyte ratio predicted mortality risk, in PAH or chronic thromboembolic PH, with an accuracy comparable to ESC/ERS-derived risk scores.29