ABSTRACT
A starting point for reaching an accurate diagnosis is taking a detailed history followed by a comprehensive examination. This should help ideas form, to allow a differential diagnosis to be produced. In order to come to a firm diagnosis, it is usual to instigate a series of appropriate investigations which help confirm or refute initial suspicions. Investigations in respiratory care are important tools in differentiating diseases, but can also play a key role in monitoring disease progression and response to treatment.
