| Ordering Code | 445T |
|---|---|
| Test Name | Tobramycin (Trough) |
| Alias | Trough Tobrex Trough AK-Tob Trough Tobi Trough Nebcin Trough TOB |
| Preferred Specimen | Plasma |
| Preferred Container | Lithium Heparin PST (Green) |
| Other Specimen/Container | Plasma in EDTA, K2 (Lavender), Serum in Plain (Red), Serum in SST (Gold) |
| Optimum Volume | 1 mL |
| Collection Instructions | Pharmacokinetic factors influence the correct time of sample collection after the last drug dose Trough: Collect trough specimen just before the next dose or at least one half-life after the peak. |
| Handling Instructions | All specimen types must be centrifuged within 2 hours of collection. Test immediately or aliquot and freeze specimen. |
| Transport Requirements | Oahu: Frozen (Aliquot) Airline: Frozen (Aliquot) |
| Specimen Stability | Frozen: 1 Month (Aliquot) Frozen samples should be thawed only once. |
| Rejection Criteria | Grossly hemolyzed, Insufficient quantity, Specimen older than stability limits specimens >2 hours old, Unaliquoted gel separator tube specimens >24 hours old |
| Avail. Stat | YES |
| Analytic Time | 1 Day |
| Methodology | Homogenous Enzyme Immunoassay (EMIT) |
Reference range(s)
The reference ranges listed below are valid on this date of March 10, 2026.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| Tobramycin (Trough) | ALL | <2.0 | >= 2.0 | <2.0 | >= 2.0 | ug/mL |