| Ordering Code | 701 |
|---|---|
| Test Name | Acetaminophen (Tylenol) |
| Alias | Valorin Triaminic Tempra Silapap Paracetamol Pain Eze Cetafen Acephen |
| Preferred Specimen | Plasma |
| Preferred Container | Lithium Heparin PST (Green) |
| Other Specimen/Container | Serum in Plain (Red), Serum in SST (Gold) |
| Optimum Volume | 0.5 mL |
| Collection Instructions | The best indicator of Acetaminophen toxicity is to measure the drug half-life by analyzing a blood level taken 4 hours post-ingestion, then a second level 3-4 hours later. Half lives exceeding 4 hours are consistent with hepatic necrosis. |
| Handling Instructions | Send aliquot if transport time >24 hours. |
| Transport Requirements | Oahu: Refrigerated Airline: Frozen |
| Specimen Stability | Ambient and Refrigerated: 24 hours (Centrifuged, unaliquoted gel separator tubes) Refrigerated: 7 days (Aliquot) Frozen: 6 Months (Aliquot) |
| Rejection Criteria | Grossly hemolyzed, Insufficient quantity, Specimen older than stability limits, Uncentrifuged gel separator tube 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 October 26, 2025.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| Acetaminophen (Tylenol) | ALL | TR = 10-30 | >= 31 | TR = 10-30 | >= 31 | ug/mL |
