| Synonym(s): | M. tuberculosis complex drug susceptibility test (DST), ETO DST, ETH DST |
| Requisition Form | G-MYCO |
| Test Description | Susceptibility test to Ethionamide by agar proportion method. |
| Pre-Approval Needed | N/A |
| Supplemental Information Required | N/A |
| Supplemental Form(s) | N/A |
| Performed on Specimens from (sources) | Pure isolate from human sources |
| Sample/Specimen Type for Testing | M. tuberculosis complex pure isolate in liquid or on solid culture medium |
| Minimum Volume/Size Required | - Liquid culture - 2.0 mL
- Solid culture - Visible growth, more than a single colony
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| Storage/Preservation Prior to Shipping | Ambient |
| Transport Medium | N/A |
| Specimen Labeling | - Two patient-specific identifiers required (e.g., patient full name, date of birth, Medical record number)
- Identifiers on specimen must exactly match submission form.
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| Shipping and Specimen Handling Requirements | - Ship according to Dangerous Goods Regulations, IATA, and/or CFR 49
- Category A shipping applies
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| Method | Agar proportion susceptibility test interpreted as either susceptible or resistant to a specific drug at critical concentration recommended by CLSI |
| Turn-around Time | 14 to 21 days |
| Interferences/Limitations | Test can only be performed on pure cultures of M. tuberculosis complex |
| Common Causes for Rejection | - Non-viable isolates
- Cultures overgrown by contaminating organisms
- Isolate not M. tuberculosis complex
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| Additional Information | - Isolates submitted for this test will be identified by this laboratory. No fee will be charged for this identification unless identification is requested on the G-MYCO requisition form.
- This laboratory will notify submitter of new drug resistance detected by this test.
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