Federal Drug Testing Cutoff Levels: Urine and Oral Fluid

Federal drug testing cutoff levels are the minimum concentrations of a drug or its metabolite that must appear in a specimen before a laboratory reports the result as positive. The Department of Health and Human Services sets these thresholds through its Mandatory Guidelines for Federal Workplace Drug Testing Programs, and as of July 7, 2025, the standard panel covers seven drug classes: marijuana, cocaine, opioids, amphetamines, MDMA/MDA, phencyclidine, and the newly added fentanyl.¹ Every specimen carries two numbers for each drug, one for the initial screen and one for the confirmatory test, and both must be met or exceeded before a positive is reported.

Why Every Drug Has Two Numbers

The initial screen is typically an immunoassay, a fast antibody-based test that sorts specimens into “negative” or “needs further testing.” Because immunoassays can cross-react with similar substances, the first cutoff sits higher to filter out noise. A specimen below the initial cutoff is reported negative with no further work.²

Specimens that meet or exceed the initial cutoff advance to confirmatory testing by gas or liquid chromatography paired with mass spectrometry. These instruments identify specific molecules by their chemical signatures, so the confirmatory cutoff can sit lower than the screening cutoff and still be reliable. A specimen has to meet or exceed both cutoffs to be reported positive.²

Urine Cutoff Levels by Drug Class

Urine is the most common specimen type in federal workplace testing. The cutoffs below come from the HHS authorized testing panels updated in January 2025 and effective July 7, 2025, and DOT applies the same numbers to safety-sensitive transportation employees through 49 CFR Part 40.¹³

Marijuana

Federal marijuana testing targets THCA, the metabolite the body produces after processing THC. The initial screen cutoff is 50 ng/mL and the confirmatory cutoff is 15 ng/mL. When a lab uses an alternate technology that can specifically identify THCA on the initial test, the first-round cutoff also drops to 15 ng/mL.

Cocaine

Cocaine testing targets benzoylecgonine, a metabolite that persists longer than cocaine itself. The initial screen cutoff is 150 ng/mL and the confirmatory cutoff is 100 ng/mL. Labs using an alternate technology specific to benzoylecgonine can apply the 100 ng/mL cutoff at the initial stage.

Opioids

Opioids are broken into several categories because the drugs differ so much in origin and potency.

Codeine and morphine share a grouped initial screen at 2,000 ng/mL. That threshold was raised from a previous 300 ng/mL specifically to reduce false positives from poppy-seed foods, which contain trace amounts of these naturally occurring opiates. The codeine confirmatory cutoff is 2,000 ng/mL, and the 2025 panels raised the morphine confirmatory cutoff to 4,000 ng/mL.

6-acetylmorphine, a metabolite unique to heroin, sits at 10 ng/mL for both the initial screen and the confirmatory test. No legitimate medication produces it, so the cutoff can be far lower.

Hydrocodone and hydromorphone are tested together with an initial screen at 300 ng/mL and confirmatory cutoffs of 100 ng/mL each. Oxycodone and oxymorphone share a lower initial screen at 100 ng/mL, also with confirmatory cutoffs of 100 ng/mL each.

Amphetamines and MDMA/MDA

Amphetamine and methamphetamine share an initial screen at 500 ng/mL, with confirmatory cutoffs of 250 ng/mL for each. MDMA and MDA use the same numbers: 500 ng/mL initial, 250 ng/mL confirmatory for each. HHS considered dropping MDMA/MDA from the panel in 2025 because of low positivity rates but kept both after public comment.⁴

Phencyclidine

PCP is the one drug class where the initial and confirmatory tests share a cutoff: 25 ng/mL for both. The low threshold reflects the drug’s potency.

Fentanyl

Fentanyl was added to the federal panel effective July 7, 2025. The initial screen cutoff is 1 ng/mL, and the confirmatory cutoff is 1 ng/mL for both fentanyl and its metabolite norfentanyl. The fentanyl immunoassay must have at least 5 percent cross-reactivity to norfentanyl so the initial screen catches specimens where most of the drug has already metabolized. No other class on the federal panel has a cutoff this low.

Oral Fluid Cutoff Levels

HHS also authorizes oral fluid (saliva) testing, and the cutoffs are lower across the board. Oral fluid detects more recent use, typically within the last five to 48 hours, while urine can catch use going back one to seven days depending on the drug and the person’s pattern. Oral fluid is harder to tamper with and can be collected under direct observation without the privacy issues of urine collection, but the detection window is shorter.

One important difference: oral fluid marijuana testing targets THC itself rather than the THCA metabolite, because THC deposits directly in saliva during use. The cutoff levels for undiluted (neat) oral fluid specimens are:⁵

Marijuana (THC): 4 ng/mL initial, 2 ng/mL confirmatory
Cocaine/benzoylecgonine: 20 ng/mL initial, 10 ng/mL confirmatory
Codeine/morphine: 30 ng/mL initial, 15 ng/mL confirmatory
6-acetylmorphine: 4 ng/mL initial, 2 ng/mL confirmatory
Oxycodone/oxymorphone: 20 ng/mL initial, 10 ng/mL confirmatory
Hydrocodone/hydromorphone: 20 ng/mL initial, 10 ng/mL confirmatory
Phencyclidine: 10 ng/mL initial, 10 ng/mL confirmatory
Amphetamine/methamphetamine: 50 ng/mL initial, 25 ng/mL confirmatory
MDMA/MDA: 50 ng/mL initial, 25 ng/mL confirmatory
Fentanyl: 4 ng/mL initial, 1 ng/mL confirmatory

The fentanyl oral fluid cutoff was added by the 2025 authorized testing panels alongside the urine cutoff.¹

Validity Thresholds That Can Fail a Specimen

Before the lab looks for drugs, it checks that the specimen is genuine, unaltered urine. Validity testing uses three measures: creatinine concentration, specific gravity, and pH. A specimen is reported dilute when creatinine falls between 2 and 20 mg/dL and specific gravity drops below 1.0030; a dilute result is not automatically positive, though the employer may require a retest. A specimen is reported substituted when creatinine drops below 2 mg/dL and specific gravity falls below 1.0010 or rises above 1.0200, values inconsistent with normal human urine. An adulterated specimen has a pH below 3.0 or above 11.0, or contains an oxidizing agent or other abnormal substance at a level indicating tampering.

Under federal rules, a substituted or adulterated specimen is treated the same as a refusal to test, with consequences identical to a positive result in most federal programs.⁶

What Happens When a Result Meets the Cutoff

A laboratory positive is not the final word. Every confirmed positive, adulterated, or substituted result goes to a Medical Review Officer, a licensed physician trained in substance abuse, who independently reviews the finding before it reaches the employer. The MRO must contact the employee in person or by phone for a confidential verification interview, explain which drug the specimen confirmed positive for, and give the employee a chance to offer a legitimate medical explanation such as a valid prescription.⁷ The employee carries the burden of proof; the MRO has discretion to allow up to five additional days for documentation when there is a reasonable basis to believe the employee can produce it.

Every collection splits the specimen into two bottles. After notification of a verified positive, the employee has 72 hours to request testing of the split specimen at a second, independent lab, verbally or in writing.⁸ If the split fails to confirm the original result, the entire test is cancelled. Missing the 72-hour window is not necessarily fatal if the employee shows the MRO a legitimate reason for the delay, such as hospitalization or inability to reach the office.

Explanations the MRO Cannot Accept

Two common explanations for a marijuana positive are ruled out by federal guidance. CBD use is not a legitimate medical explanation for a laboratory-confirmed marijuana positive; DOT states this directly, and the MRO will verify the result as positive regardless of whether the employee only used CBD products.⁹ Passive inhalation is also not accepted. SAMHSA’s position is that secondhand marijuana smoke has very little possibility of producing a positive urine result at the 15 ng/mL THCA confirmatory cutoff, and the MRO is prohibited from accepting passive exposure as a medical explanation.²

Who These Cutoffs Apply To

The federal cutoffs apply directly to two groups. The first is federal civilian employees tested under executive orders and the HHS Mandatory Guidelines. The second, and much larger, is safety-sensitive transportation workers regulated by DOT: commercial truck and bus drivers, airline pilots and mechanics, railroad employees, pipeline workers, and transit operators. DOT agencies adopt the HHS thresholds through 49 CFR Part 40.³

Private employers that are not federally regulated can set their own cutoff levels and test for additional substances. Many voluntarily adopt the federal numbers as a benchmark, but they are not required to. If your employer is not covered by DOT or another federal agency, confirm which panel and cutoffs apply to you. The numbers above are the federal floor, not a universal ceiling.

1
Federal Register. Mandatory Guidelines for Federal Workplace Drug Testing Programs-Authorized Testing Panels
2
Substance Abuse and Mental Health Services Administration. Medical Review Officer Guidance Manual for Federal Workplace Drug Testing Programs
3
eCFR. 49 CFR Part 40 – Procedures for Transportation Workplace Drug and Alcohol Testing Programs
4
GovInfo. Federal Register Vol 90 No 167 – Mandatory Guidelines for Federal Workplace Drug Testing Programs
5
Federal Register. Mandatory Guidelines for Federal Workplace Drug Testing Programs-Oral Fluid
6
eCFR. 49 CFR 40.191 – What Is a Refusal to Take a DOT Drug Test, and What Are the Consequences
7
eCFR. 49 CFR Part 40 Subpart G – Medical Review Officers and the Verification Process
8
U.S. Department of Transportation. DOT Rule 49 CFR Part 40 Section 40.171
9
U.S. Department of Transportation. DOT CBD Notice