Ethambutol Quantitative, Serum or Plasma
Also known as: ETHAMBUT
Use
The Ethambutol Quantitative test is used for therapeutic drug monitoring of ethambutol levels in serum or plasma. This test helps ensure that the drug concentration remains within the therapeutic range, which is typically 2-5 mcg/mL at 4 hours after the last dose. Monitoring these levels is critical to avoid subtherapeutic dosages and prevent toxicity, as levels above 10 mcg/mL are considered toxic.
Special Instructions
This test is performed by a non-ARUP Laboratory. The test requires separate specimens if multiple tests are ordered simultaneously. Ensure proper specimen preparation by separating from cells as soon as possible or within 2 hours of collection.
Limitations
The performance characteristics of this test have been determined by NMS Labs, and it has not been cleared or approved by the US Food and Drug Administration. Hence, it should be used following clinical judgement and within the scope determined by relevant guidelines and policies. This test requires proper collection and handling of specimens to ensure accurate results.
New York Approved
Methodology
Mass Spectrometry
Biomarkers
LOINC Codes
- 3607-9
Result Turnaround Time
8-11 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
1 mL
Minimum Volume
0.4 mL
Container
ARUP Standard Transport Tube
Collection Instructions
Separate from cells ASAP or within 2 hours of collection.
Storage Instructions
Refrigerated. Also acceptable: Room temperature or frozen.
Causes for Rejection
Separator tubes.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 1 month |
| Refrigerated | 1 month |
| Frozen | 1 month |