Diagnosis of Tuberculosis

Clinical Diagnosis

Clinical diagnosis of TB involves a careful and extensive history-taking, which includes asking the patient questions relative to symptoms suggestive of TB disease:

·         Prolonged fever, cough (with or without haemoptysis),

·         Anorexia,

·         Weight loss

·         Haemoptysis – Cough out blood (once or recurrent)

·         Cough (dry/productive sputum)

·         Fatigue

·         Night sweats

Laboratory diagnosis

·         Early identification of TB cases and putting them on effective treatment is important in TB care and control.

·         Diagnosis of PTB depends on the identification of tubercle bacilli either by sputum smear microscopy or culture and identification of bacterial DNA using molecular techniques

·         There are two common methods for the detection of AFB in clinical specimens:

o   The Ziehl-Neelsen (ZN) technique using bright field microscopes, and

o   The Auramine O technique using light-emitting diode fluorescence microscope (LED FM)

·         Chest x-ray may be very useful as a screening tool for PTB.


Doctor Pointing X-ray Result Beside Man Wearing Black Suit

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