We decided to complete our research in the 4th year, and publish the data. The data are under evaluation.

The Turkish Thoracic Society Usual Interstitial Pneumonia Registry (TURK-UIP) is a collaborative project to coordinate a team of investigators from various regions of Turkey. The purpose of the Registry is to collect epidemiological data on patients with idiopathic pulmonary fibrosis and other causes of UIP, and to obtain information about the natural course of the disease and the treatment response.

The TURK-UIP Registry is a web based application that will store information about patients. A HRCT pattern consistent with UIP will be confirmed by 3 radiologists. At the 3-month visits, the pulmonary function tests and the 6-minute walk test will be recorded. Patients will be prospectively followed for a 5-year period.

Inclusion Criteria:

1. Understand and sign the informed consent document.
2. The presence of a definite or possible UIP pattern on high resolution computed tomography (HRCT) or a histologic UIP pattern (definite, probable and possible) on surgical lung biopsy (as defined by ATS/ERS/JRS/ALAT criteria).

Exclusion Criteria:

1. HRCT findings inconsistent with UIP pattern (peribronchovascular predominance, extensive ground glass abnormality,profuse micronodules, discrete cysts , consolidation in bronchopulmonary segment(s)/lobe(s), diffuse mosaic attenuation/air-trapping),
2. Histopathological findings inconsistent with UIP pattern (as defined by ATS/ERS/JRS/ALAT criteria).

Subjects diagnosed with IPF and other causes of UIP.