RESULTS: Three variables which were significantly different on multivariate analysis were six minute walk distance, Borg dyspnea scale and saturation of oxygen at six minutes. Scores were assigned based on beta regression coefficients. Total score ranges from 0 to 7. Using C-statistics the area under receiver operator curve (ROC)=87.50% in Training cohort and P <0.001; based on a score ≥1, sensitivity of predicting PH=100%, specificity was 37.0%; for score=5, sensitivity=86.0%, specificity=75.4%; score=7, sensitivity=68.0%, specificity=91.8%. In Validation Cohort, ROC = 88.87% and P<0.001; for score ≥1, sensitivity=100%, specificity=44.9%. For score of 5, sensitivity=87.5% and specificity=77.3%; for score=7, sensitivity=58.3%, specificity=92.4%.