Toxicology
Drugs of abuse panel
A drugs of abuse panel is a qualitative point-of-care screen that detects several drug classes at once, for example amphetamines, cannabinoids, cocaine metabolite, opiates and benzodiazepines, in urine or oral fluid. It is a presumptive screen only: any non-negative result should be confirmed by a laboratory method such as LC-MS/MS before clinical, forensic or workplace decisions are made.
Why it is measured
It supports rapid assessment in emergency, addiction, mental health, custody and occupational settings where knowing recent drug exposure quickly can guide immediate management. Testing near the patient avoids specimen-transport delays when a fast triage answer is needed.
| Typical range | Qualitative result (negative or presumptive positive) assessed against class-specific cutoff concentrations, not a numeric reference range. Typical SAMHSA-aligned urine screening cutoffs for the federal five-panel are amphetamines 500 ng/mL, cannabinoids (THC-COOH) 50 ng/mL, cocaine metabolite (benzoylecgonine) 150 ng/mL, opiates (morphine) 2000 ng/mL and phencyclidine 25 ng/mL. Additional classes such as benzodiazepines fall outside the federal panel and use manufacturer-set cutoffs. Oral-fluid cutoffs differ and are device-specific, for example THC around 25 ng/mL on some readers, with regulated screening cutoffs generally lower. The expected result in an unexposed adult is negative. Cutoffs vary by analyte, specimen matrix and manufacturer. |
|---|---|
| Sample | Urine (most common) or oral fluid; many urine devices test directly from the original collection cup. |
| Turnaround | About 5 to 10 minutes for lateral-flow cassettes and cups; oral-fluid analysers typically display a read within a few minutes of sampling. |
Point of care devices that report it
- Dräger DrugTest 5000 (oral-fluid analyser)
- Abbott SoToxa handheld oral-fluid reader (formerly Alere DDS2)
- Securetec DrugWipe 5S/6S oral-fluid screening test
- SureScreen Diagnostics multi-drug urine cassette/cup
- Quidel Triage TOX Drug Screen urine panel (Triage MeterPro)
- Abbott/Alere iCup urine multi-drug cup
Questions, answered
Does a positive screen confirm drug use?
No. A point-of-care panel gives a presumptive result only. Cross-reactivity with some prescribed or over-the-counter medicines, and occasionally certain foods, can produce false positives, so any non-negative result should be confirmed by a definitive laboratory method such as LC-MS/MS or GC-MS before any clinical or employment action.
Why might someone who has used a drug still screen negative?
Common reasons include the concentration sitting below the test cutoff, the timing relative to last use falling outside the detection window, a dilute or adulterated specimen, or the substance simply not being one of the classes on that particular panel. Many synthetic opioids and newer benzodiazepine analogues, and fentanyl unless specifically included, are not detected by standard panels.
When is oral fluid used instead of urine?
Oral fluid allows collection to be directly observed and tends to reflect more recent use, which suits roadside and custody screening; urine generally offers longer detection windows and is widely used for clinical and workplace testing. The choice depends on the setting, the question being asked and local policy.