Quick answer: Methamphetamine shows up on a drug test as a positive in the MET (or mAMP) column of a urine cup, dip card, or oral fluid test. Screens American Screening Corp supplies for clinics, employers and courts use cutoffs of 500 or 1,000 ng/mL in urine and detect use for about 2 to 4 days. Every positive is preliminary; confirm by GC/MS or LC-MS/MS laboratory testing.
- What it detects: methamphetamine and its metabolite amphetamine, reported on the MET/mAMP line (and sometimes the AMP line).
- Status: American Screening Corp supplies FDA-cleared, CLIA-waived urine and oral fluid screens; check each package insert for the exact cutoff.
- Next step: a non-negative screen is never a final result. Send the specimen for laboratory confirmation.
What does methamphetamine look like on a drug test result?
On a multi-panel urine cup or dip card, methamphetamine is printed as MET, mAMP, or MAMP. A line in the test region means negative; no line in that region means a non-negative (presumptive positive) result for that drug.
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Many panels also carry an AMP (amphetamine) line. Methamphetamine is metabolized partly to amphetamine, so a methamphetamine user can screen non-negative on both lines. Always read the line labels against the package insert, because layouts differ by device.
Buyers stocking sites can compare formats in our drug test cups and our drug test dip cards.
What cutoff levels apply to methamphetamine?
A cutoff is the concentration, in nanograms per milliliter (ng/mL), at or above which the device reads non-negative. Cutoffs vary by program type.
| Test type | Typical screening cutoff | Typical detection window | Common users |
|---|---|---|---|
| Non-regulated urine cup or dip card (MET) | 500 or 1,000 ng/mL | About 2-4 days | Clinics, treatment centers, probation, employers |
| Federal-program urine initial test (amphetamines) | 500 ng/mL | About 2-4 days | DOT and federal-program collections through certified labs |
| Federal-program urine confirmation (methamphetamine) | 250 ng/mL, with amphetamine at 100 ng/mL or more | About 2-4 days | Certified laboratories and MROs |
| Oral fluid screen | Set by device; federal initial test is 50 ng/mL | Roughly 1-3 days | Post-incident, reasonable-suspicion, on-site checks |
Federal values come from the HHS Mandatory Guidelines for Federal Workplace Drug Testing Programs (SAMHSA), as of 2026. Detection windows are typical ranges, not guarantees; heavy or chronic use, urine concentration, and metabolism can extend or shorten them.
How long does methamphetamine stay detectable?
In urine, methamphetamine is generally detectable for about 2 to 4 days after last use. Oral fluid windows are shorter, commonly 1 to 3 days. Hair testing reaches back about 90 days but is a laboratory method, not a point-of-collection cup.
For a program, match the matrix to the question. Use urine for recent-use monitoring, oral fluid when you need a short window and observed collection, and laboratory testing when the result must stand up to challenge.
What else can cause a non-negative MET or AMP line?
Immunoassay screens detect a drug family, so some substances cross-react. Reported examples include certain decongestants and prescription medications, and the l-methamphetamine isomer found in some nasal inhalers.
This is why a screen is only a screen. Laboratory GC/MS or LC-MS/MS confirmation identifies the exact compound and concentration. In DOT-regulated programs, a Medical Review Officer reviews confirmed positives under 49 CFR Part 40 before a result is verified.
How should you read and act on a result?
- Confirm the specimen is within temperature range and collected per the device instructions.
- Read the result inside the time window in the insert, not later.
- Match each line to its label (MET/mAMP versus AMP).
- Record the lot number, time, collector, and result on your chain-of-custody or log form.
- Treat any non-negative as preliminary and send the specimen for laboratory confirmation.
Program checklist for buyers
- Choose a cutoff that matches your written policy and any regulator or court order.
- Verify FDA clearance and CLIA-waived status on the device you order.
- Stock enough lots with matching expiry dates for your site volume.
- Pre-arrange a laboratory for GC/MS or LC-MS/MS confirmation.
- Train collectors on observed or temperature-checked collection where your policy allows.
- Pair testing with pre-employment screening; our sister division Reveal Background runs employment background checks.
Need volume pricing, private label, or help picking a panel? Contact American Screening Corp. We ship the same day nationwide from Shreveport, Louisiana.
Frequently asked questions
What does methamphetamine show up as on a drug test?
It appears as MET, mAMP, or MAMP on the panel. A missing line in the test region means a non-negative result. Confirm every positive by GC/MS or LC-MS/MS.
What is the cutoff for methamphetamine in urine?
Common screening cutoffs are 500 or 1,000 ng/mL. The federal initial amphetamines test is 500 ng/mL, and confirmation is 250 ng/mL, per SAMHSA's HHS Mandatory Guidelines.
How long can a urine test detect methamphetamine?
Typically about 2 to 4 days after last use. Dose, frequency, and individual metabolism change that range.
Can a screen be wrong about methamphetamine?
Yes. Cross-reacting substances can cause non-negative screens, so results are preliminary until laboratory confirmation by GC/MS or LC-MS/MS.
Sources
- SAMHSA: Mandatory Guidelines for Federal Workplace Drug Testing Programs
- NIDA: Methamphetamine DrugFacts
- eCFR: 49 CFR Part 40, Procedures for Transportation Workplace Drug and Alcohol Testing Programs
This article is general information, not legal or medical advice.
