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Classification of TB on the basis of Type of Diagnosis
Learning ObjectivesThe learner will be able to
- Classify TB based on diagnosis and
- Distinguish between Microbiologically confirmed and clinical TB
H5Content
Content
On the basis of diagnosis, Tuberculosis (TB) can be classified into 2 main types:
- Microbiologically confirmed TB
- Clinically diagnosed TB
Microbiologically Confirmed TB
- Microbiologically confirmed TB refers to a presumptive TB case from which a biological specimen is positive for acid-fast bacilli/ Mycobacterium tuberculosis on smear microscopy, culture, or on a rapid diagnostic molecular test (such as Cartridge-based Nucleic Acid Amplification Test (CBNAAT)/ Truenat).
- All such diagnosed cases should be notified at the source, regardless of whether TB treatment has started.
Clinically Diagnosed TB
- Clinically diagnosed TB refers to a presumptive TB case that is not microbiologically confirmed but has been diagnosed with active TB by a clinician who has decided to give the patient a full course of anti-TB treatment.
- This definition includes cases diagnosed on the basis of X-ray abnormalities or suggestive histology or extrapulmonary cases without laboratory confirmation.
- Clinically diagnosed cases subsequently found to be microbiologically positive (before or after starting treatment) should be reclassified as microbiologically confirmed.
Resources
- Training Modules (1-4) for Programme Managers and Medical Officers, 2020.
- Definitions and Reporting Framework for Tuberculosis, WHO, 2013.
Assessment
Question | Answer 1 | Answer 2 | Answer 3 | Answer 4 | Correct answer | Correct explanation | Page id | Part of Pre-test | Part of Post-test |
TB is classified on the basis of diagnosis into which of the following? | Microbiologically confirmed TB and clinically diagnosed TB | Mono-resistant TB and poly-resistant TB | Recurrent cases and previously treated cases | None of the above | 1 | TB can be classified on the basis of diagnosis into 2 main types: Microbiologically confirmed TB and Clinically diagnosed TB. | |
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