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  1. Diagnosing Tuberculosis | Tuberculosis (TB) | CDC

    Jan 17, 2025 · A common sample is a sputum (phlegm) specimen to test for TB of the lungs. To collect the sample, you cough sputum into a small container. Generally, at least three sputum …

  2. Testing for Tuberculosis | Tuberculosis (TB) | CDC

    Jun 17, 2024 · These tests may include a chest x-ray, and a test of the sputum (phlegm) you cough up. A negative test result for TB infection means inactive TB or active TB disease is …

  3. Xpert MTB/RIF Assay | Tuberculosis (TB) | CDC

    Apr 22, 2024 · The Xpert MTB/RIF assay is a nucleic acid amplification (NAA) test that uses a disposable cartridge with the GeneXpert Instrument System. A sputum sample is collected …

  4. Tuberculosis | Technical Instructions for Panel Physicians

    May 15, 2024 · An applicant may have a positive sputum smear but a negative molecular test because NTM organisms can cause positive AFB smears. In that scenario, panel physicians …

  5. Clinical and Laboratory Diagnosis for Tuberculosis

    Jan 31, 2025 · Other sputum specimen collection methods include inducing sputum, bronchoscopy, and gastric washing. Health care providers should use precautions to control …

  6. Clinical Testing and Diagnosis for Tuberculosis

    Apr 17, 2025 · For more details on interpreting TB skin test results, please visit Clinical Testing Guidance for Tuberculosis: Tuberculin Skin Test. TB skin results should only be read by a …

  7. Testing for Tuberculosis: Blood Test | Tuberculosis (TB) | CDC

    Jan 31, 2025 · A tuberculosis (TB) blood test uses a blood sample to find out if you are infected with TB germs.

  8. Laboratory Testing for Legionella | Legionella | CDC

    Jun 9, 2025 · Legionella UAT for Legionella pneumophila serogroup 1 Lower respiratory specimens include sputum, bronchoalveolar lavage, tracheal aspirate, and lung tissue. …

  9. Clinical Testing Guidance for Tuberculosis: Tuberculin Skin Test

    Jan 31, 2025 · The TB skin test (also known as the Mantoux tuberculin skin test or TST) is one method of determining whether a person is infected with TB bacteria. Reliable administration …

  10. Clinical Guidance for Legionella Infections | Legionella | CDC

    Jun 9, 2025 · Lower respiratory secretions include sputum and bronchoalveolar lavage. Specimen collection Best practice is to obtain both a lower respiratory specimen for culture or molecular …