I sent an absolutely foul specimen of sputum away for analysis a couple of weeks ago and it has come back negative. I have been coughing this up for around 18months now and I had to suggest to the doctor that it might be a good idea to send away a specimen of sputum as it might show something up. I cannot understand how the filthy gunge can be normal. I went to see another doctor (the only one I could get) and she said that I was to send in another specimen for TB and microplasma. She made it clear that she did not think I had these conditions, (because they are rare) but wanted to cover all bases. By this time I was disheartened and said to her that I did not think I would go to the Consultant, because all the things she talked about I thought would show up on x-ray. She insisted I see the consultant because sometimes lungs and airways needed much closer inspection than I have had so far. Has anyone any experience of those other lung conditions.