An induration >5 mm is considered positive in a patient who has been exposed to someone with active TB, has a chest X-ray that suggests TB, or is HIV-positive or otherwise immunocompromised.6 A welt >10 mm is considered positive in IV drug users, recent immigrants from a country where ...
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A chest X-ray is not useful to establish a 16 DIAGNOSIS AND ASSESSMENT diagnosis in COPD, but it is valuable in excluding alternative diagnoses and establishing the presence of significant comorbidities such as concomitant respiratory (pulmonary fibrosis, bronchiectasis, pleural diseases), skeletal (e...