This article has a calculator that allows physicians to calculate expected prognosis in IPF. Generally clinicians quote a median survival of 3 years for all of their patients at the time of diagnosis. This paper clearly allows us to stratify patients into 3 groups with very different prognoses. However the calculation is somewhat cumbersome and without a "medcalc" option, clinicians are likely to avoid doing the calculation and therefore prevent patients with this devastating disease from getting a more accurate prognosis.

Reference: Ley et al. A multidimensional index and staging system for idiopathic pulmonary fibrosis. Ann Intern Med 2012; 156:684-691.