Persistent cough and or dyspnoea can usually be attributed to one of the following:
It may not be possible to determine the underlying cause of cough and dyspnoea on clinical history and physical examination alone and hence laboratory tests may be of critical value.
Sputum for AFB x 3 (can be done at all levels)
Sputum for pyogenic culture and sensitivity
Bronchoscopy studies (consultant hospitals)
ECG (where available)