instruction: find the number of patients who are diagnosed with postinflammatory pulmonary fibrosis and were ordered urine lab test.
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN lab ON demographic.hadm_id = lab.hadm_id WHERE diagnoses.short_title = "Postinflam pulm fibrosis" AND lab.fluid = "Urine"