Quick answer: Nortriptyline shows up on a urine drug test only when the panel includes tricyclic antidepressants (TCA), commonly screened at a 1,000 ng/mL cutoff. Standard SAMHSA 5-panel and DOT tests do not include TCA. Detection in urine typically lasts about 2 to 7 days. Any positive is preliminary; confirm by GC/MS or LC-MS/MS laboratory testing.
- Nortriptyline is a prescription tricyclic antidepressant. It is detected by a TCA assay, not by the common 5-panel drugs of abuse.
- A TCA positive means the class was detected, not that the donor misused a drug. It is preliminary until laboratory confirmation.
- American Screening Corp supplies urine cups and dip cards to clinics, courts, treatment centers and employers. Confirm the panel on each product listing before you order.
Does nortriptyline show up on a drug test?
Yes, but only on a test that looks for it. Nortriptyline is a tricyclic antidepressant (TCA), a drug class with its own immunoassay. The SAMHSA-style 5-panel (marijuana, cocaine, opiates, amphetamines, phencyclidine) does not include TCA.
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Multi-panel cups and dips, often 10-panel and above, may add a TCA line. Always read the panel list and the package insert for the exact lot you buy.
Which tests detect nortriptyline, and at what cutoff?
A TCA immunoassay is a class screen. It reacts to the tricyclic structure, so it does not name the specific drug. The cutoff commonly used for TCA urine screens is 1,000 ng/mL. Confirm the cutoff printed on your device, because it can vary by manufacturer.
| Test type | Detects nortriptyline? | Typical note |
|---|---|---|
| SAMHSA 5-panel urine cup | No | TCA is not a federal 5-panel drug |
| DOT 49 CFR Part 40 urine test | No | DOT tests the 5 federal drug classes only |
| Multi-panel cup or dip with a TCA line | Yes, as a class | Commonly 1,000 ng/mL; check the insert |
| Oral fluid test | Usually no | TCA is not a standard oral fluid panel line |
| GC/MS or LC-MS/MS confirmation | Yes, by specific compound | Identifies the exact drug and level |
How long does nortriptyline stay detectable?
Nortriptyline has a long elimination half-life, reported in the range of roughly 18 to 44 hours in the National Library of Medicine's MedlinePlus drug information. In urine, a TCA screen is typically positive for about 2 to 7 days after the last dose. The window depends on dose, duration of use, liver function, kidney function and urine concentration.
Patients on a daily prescription will usually screen positive the whole time they take it, if the panel includes TCA.
Can nortriptyline cause a false positive for another drug?
Immunoassays can cross-react with structurally similar compounds. Tricyclic drugs are among the medications laboratories review when a preliminary result does not match the donor's history. Do not treat a screen as proof of any drug. The only way to resolve it is confirmation by GC/MS or LC-MS/MS at a laboratory.
The reverse also applies. Other medications can trigger a TCA positive, so a TCA line alone does not prove the donor took nortriptyline.
How should a clinic, court or employer handle a TCA positive?
Treat the result as preliminary. A TCA positive is common in patients with a valid prescription, so a verified medication list matters more than the screen itself.
- Record the device, lot number, cutoff and read time.
- Mark the result "preliminary; confirm by GC/MS or LC-MS/MS laboratory testing."
- Send the specimen for laboratory confirmation under your chain-of-custody procedure.
- Route the confirmed result to a qualified reviewer, such as a medical review officer, to verify prescriptions.
- Apply your written policy and applicable state law before any action.
Do DOT and federal workplace programs test for nortriptyline?
No. DOT-regulated testing under 49 CFR Part 40 and federal workplace programs under the HHS Mandatory Guidelines test a fixed set of drug classes, and TCA is not among them. Non-regulated employers, treatment programs and probation offices may add TCA by policy. If your program is not federally regulated, write the added analyte into your policy so every donor is tested consistently.
Checklist: choosing a test when nortriptyline matters
- Decide whether your policy requires a TCA line, then confirm it appears on the panel list.
- Verify the cutoff in ng/mL on the package insert for your lot.
- Check the FDA clearance and CLIA-waived status of the specific product on its listing.
- Set a written rule that every positive is preliminary and goes to laboratory confirmation.
- Collect prescription information through a qualified reviewer, not at the collection site.
- Train staff to read results at the time stated in the instructions.
Buyers who need a TCA line can browse our drug test cups and match the panel to the program. For bulk quantities, custom panels or private label, contact American Screening Corp.
Frequently asked questions
Does nortriptyline show up on a standard 5-panel drug test?
No. The SAMHSA-style 5-panel covers marijuana, cocaine, opiates, amphetamines and phencyclidine. Nortriptyline appears only when the panel adds a TCA line.
What is the cutoff for a TCA urine screen?
A common TCA cutoff is 1,000 ng/mL in urine. Cutoffs vary by manufacturer, so read the package insert for your lot.
How long can nortriptyline be detected in urine?
Typically about 2 to 7 days after the last dose. Dose, duration of use and kidney and liver function change the window.
Is a TCA positive proof of misuse?
No. A TCA positive is preliminary and may reflect a valid prescription. Confirm by GC/MS or LC-MS/MS laboratory testing and have a qualified reviewer verify medications.
Sources
- MedlinePlus (National Library of Medicine): Nortriptyline
- U.S. Department of Transportation: 49 CFR Part 40 (ODAPC)
- SAMHSA: Workplace Drug Testing and the HHS Mandatory Guidelines
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This article is general information, not legal or medical advice.
