However, these two methods both have their blind spots. Chest X-rays will not necessarily be able to accurately capture lesions, as the lungs have five lobes, and there are more than 100 different types of bacillus that commonly infect the lungs. Moreover, tests of sputum will not always reliably detect M. tuberculosis. Under these circumstances, a physician's experience and professional training are extremely important.
但這兩種方法都有盲點：胸部 X 光未必能精準地照出病灶；肺有五葉、桿菌也有上百種，驗痰也未必能抓到結核桿菌，在這種情況下，醫生的經驗和專業訓練便十分重要。