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What laboratory test is most useful for diagnosing tuberculosis?

Practice Questions

Q1
What laboratory test is most useful for diagnosing tuberculosis?
  1. Complete blood count
  2. Acid-fast bacilli smear
  3. Liver function tests
  4. Urinalysis

Questions & Step-by-Step Solutions

What laboratory test is most useful for diagnosing tuberculosis?
  • Step 1: Understand that tuberculosis (TB) is caused by a bacteria called Mycobacterium tuberculosis.
  • Step 2: Know that to diagnose TB, doctors need to find this bacteria in a sample from the patient.
  • Step 3: The acid-fast bacilli (AFB) smear test is a laboratory test that helps find the bacteria.
  • Step 4: In this test, a sample (usually sputum or mucus) is taken from the patient.
  • Step 5: The sample is then stained and examined under a microscope to see if the bacteria are present.
  • Step 6: If the bacteria are seen, it indicates that the patient may have tuberculosis.
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