| Ordering Code | 701 |
|---|---|
| Test Name | Acetaminophen |
| Alias | Valorin Triaminic Tempra Silapap Paracetamol Phenacetin Pain Eze Cetafen Acephen N-acetyl-para-aminophenol Datril Acetaminophen (Tylenol) |
| 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 | Draw sample at least 4 hours after drug ingestion to ensure that the plasma/serum concentrations have peaked. Ingestion of massive quantities of acetaminophen or of a modified- release preparation may result in delayed peak levels. In such cases, a second level should be ordered/obtained. |
| Handling Instructions | All specimen types must be centrifuged within 2 hours of collection. If no gel separation present in tube and testing is delayed, plasma/serum is aliquoted from cells within 2 hours of collection Send aliquot if transport time >24 hours. |
| Transport Requirements | Oahu: Refrigerated Airline: Refrigerated Send frozen if transport >7 Days |
| Specimen Stability | Refrigerated: 1 Day (Centrifuged, unaliquoted gel separator tubes), 7 Days (Aliquot) Frozen: 6 Months (Aliquot) Frozen samples should be thawed only once. |
| 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 March 26, 2026.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| Acetaminophen | ALL | 10-30 | >= 31 | 10-30 | >= 31 | ug/mL |