What does a 12-panel drug test test for?

A 12-panel drug test screens for: marijuana (THC), cocaine, opiates (codeine, morphine, heroin), amphetamines (including methamphetamine), PCP, barbiturates, benzodiazepines (Xanax, Valium), methadone, propoxyphene (Darvon — withdrawn from U.S. market), methaqualone (Quaaludes — no longer prescribed in U.S.), oxycodone (OxyContin, Percocet), and MDMA (ecstasy/molly).

Does a 12-panel drug test test for alcohol?

No, a standard 12-panel drug test does not include alcohol. Alcohol testing requires a separate EtG (ethyl glucuronide) urine test, a breathalyzer, or a blood alcohol test. However, some testing facilities offer an expanded 12-panel that adds EtG for alcohol — this is sometimes called a '12-panel plus EtG' or '13-panel' test. If you are on probation, your officer may order EtG testing separately.

Does a 12-panel drug test test for fentanyl?

No, a standard 12-panel drug test does not include fentanyl. Fentanyl is a synthetic opioid that is not detected by standard opiate immunoassays. Testing for fentanyl requires a separate, dedicated fentanyl panel. Some probation offices and drug courts have added fentanyl testing to their screening protocols due to the opioid crisis.

Does a 12-panel test detect Suboxone (buprenorphine)?

No, a standard 12-panel drug test does not detect buprenorphine (Suboxone, Subutex). Buprenorphine is a synthetic opioid that requires its own dedicated immunoassay. Probation officers and drug courts often add a separate buprenorphine panel to the 12-panel test when monitoring individuals in medication-assisted treatment.

How far back does a 12-panel drug test go?

For a urine-based 12-panel test, detection windows range from 1 to 30 days depending on the substance. Most drugs are detectable for 1 to 4 days after last use. Marijuana is the notable exception — heavy daily users may test positive for 30 or more days after stopping. If the test uses hair samples instead of urine, the detection window extends to approximately 90 days for all substances.

What is the difference between a 10-panel and 12-panel drug test?

A 12-panel test includes everything on the 10-panel test plus two additional substances: oxycodone and MDMA (ecstasy). The 10-panel test screens for THC, cocaine, opiates, amphetamines, PCP, barbiturates, benzodiazepines, methadone, propoxyphene, and methaqualone. The 12-panel adds oxycodone (which is not reliably detected by the standard opiate panel) and MDMA.

Can secondhand marijuana smoke cause a positive on a 12-panel test?

It is extremely unlikely under normal conditions. Studies show that secondhand marijuana smoke exposure in well-ventilated areas does not produce enough THC metabolite to exceed standard urine cutoffs (50 ng/mL for screening). However, prolonged exposure in unventilated spaces (hotboxing) could theoretically cause a low-level positive, though this is rare in real-world scenarios.

How long does marijuana stay in your system for a 12-panel test?

For a urine test: single use — 3 to 4 days; moderate use (a few times per week) — 5 to 7 days; daily use — 10 to 15 days; heavy daily use — 15 to 30+ days. Marijuana (THC) is fat-soluble and accumulates in body fat with repeated use, which is why chronic users have much longer detection windows. Body fat percentage, hydration, and metabolism all affect individual detection times.

Does probation use a 12-panel drug test?

Many probation and parole offices use a 12-panel test or an expanded panel. The specific panel varies by jurisdiction, probation officer, and the terms of your supervision. Some probation offices use a standard 12-panel, while others add substances like EtG (alcohol), fentanyl, buprenorphine, or tramadol. Your probation conditions should specify what you will be tested for — ask your officer if you are unsure.

12-Panel Drug Test: What Does It Test For?

Complete list of 12 substances tested, detection windows, who uses this test, and how it compares to 5-panel and 10-panel tests.

Last updated: 2026-03-25

Quick Answer

A 12-panel drug test screens for 12 categories of substances: marijuana (THC), cocaine, opiates (codeine, morphine, heroin), amphetamines, PCP, barbiturates, benzodiazepines, methadone, propoxyphene, methaqualone (Quaaludes), oxycodone, and MDMA (ecstasy). It is the most comprehensive standard panel available and builds on the 10-panel test by adding oxycodone and MDMA.

The 12-panel test is commonly used by probation and parole offices, drug courts, pain management clinics, child custody cases, and some employers with strict drug-free workplace policies. It is more expensive than 5-panel or 10-panel tests, which is why most standard employment screenings use a 5-panel test instead.

Substances Tested — Detection Windows

Substance	Common Names	Detection Window	Notes
Marijuana (THC)	Weed, pot, cannabis, edibles, dabs	3 to 30 days (urine); up to 90 days (hair)	Single use: 3 to 4 days. Moderate use: 5 to 7 days. Daily/heavy use: 10 to 30+ days. THC is fat-soluble and accumulates with chronic use, which extends the detection window significantly.
Cocaine	Coke, crack, snow, blow	2 to 4 days (urine); up to 90 days (hair)	Single use: 1 to 2 days. Regular use: 2 to 4 days. Heavy/binge use: up to 14 days. The test detects benzoylecgonine, a cocaine metabolite. Cutoff: 150 ng/mL (screen), 100 ng/mL (confirmation).
Opiates (codeine, morphine, heroin)	Codeine, morphine, heroin, Vicodin (partial)	1 to 3 days (urine); up to 90 days (hair)	Standard opiate immunoassays detect codeine, morphine, and heroin (via its metabolite 6-MAM). They do NOT reliably detect synthetic opioids like fentanyl, oxycodone, or buprenorphine — those require separate panels. Poppy seeds can cause a positive result.
Amphetamines	Adderall, Dexedrine, speed, meth, crystal	1 to 4 days (urine); up to 90 days (hair)	Detects amphetamine and methamphetamine. Prescription amphetamines (Adderall, Vyvanse) will trigger a positive. You will need to disclose your prescription to the Medical Review Officer (MRO) who reviews the results.
Phencyclidine (PCP)	Angel dust, wet, PCP	7 to 14 days (urine); up to 90 days (hair)	PCP has a relatively long detection window. Chronic use can be detected for up to 30 days. PCP is included on all standard drug panels (5, 10, and 12).
Barbiturates	Phenobarbital, Seconal, Nembutal, barbs	2 to 15 days (urine)	Short-acting barbiturates: 2 to 4 days. Long-acting (phenobarbital): up to 15 days. Barbiturate prescriptions have declined significantly since benzodiazepines became more common, but they are still used for seizure disorders and some sedation protocols.
Benzodiazepines	Xanax, Valium, Klonopin, Ativan	1 to 7 days (urine); up to 6 weeks (heavy use)	Short-acting (Xanax, Ativan): 1 to 4 days. Long-acting (Valium, Klonopin): 5 to 7 days, up to 6 weeks with chronic use. Standard immunoassays may not detect all benzodiazepines equally — alprazolam, lorazepam, and clonazepam are often missed at standard cutoffs and may require confirmation testing.
Methadone	Methadose, Dolophine	3 to 7 days (urine)	Methadone is a synthetic opioid used for opioid addiction treatment and pain management. It is NOT detected by the standard opiate immunoassay — that is why it has its own panel. Patients in methadone maintenance programs will test positive.
Propoxyphene	Darvon, Darvocet (withdrawn from U.S. market in 2010)	1 to 2 days (urine)	Propoxyphene (Darvon/Darvocet) was withdrawn from the U.S. market in November 2010 due to cardiac risks. It remains on many 12-panel tests because the testing configuration has not been updated and some generic versions may still be available internationally.
Methaqualone	Quaaludes, ludes	10 to 14 days (urine)	Methaqualone (Quaaludes) has not been legally manufactured or prescribed in the United States since 1984. Like propoxyphene, it remains on 12-panel tests as a legacy substance. Positive results are extremely rare in the U.S.
Oxycodone	OxyContin, Percocet, Roxicodone	1 to 4 days (urine)	Oxycodone is NOT reliably detected by the standard opiate immunoassay, which is why it has its own dedicated panel on the 12-panel test. This is one of the two substances that separates the 12-panel from the 10-panel. Prescription users should disclose to the MRO.
MDMA / Ecstasy	Ecstasy, molly, X, E	1 to 3 days (urine); up to 90 days (hair)	MDMA (3,4-methylenedioxymethamphetamine) is the other substance that distinguishes the 12-panel from the 10-panel. Some amphetamine immunoassays cross-react with MDMA, but a dedicated MDMA panel provides more reliable detection.

Panel Comparison — 5 vs. 10 vs. 12

Panel	Substances	Used By	Typical Cost
5-Panel	THC, cocaine, opiates, amphetamines, PCP	Most employers, DOT/federal jobs, standard pre-employment	$40 to $80
10-Panel	5-panel + barbiturates, benzodiazepines, methadone, propoxyphene, methaqualone	Law enforcement, government jobs, occupational medicine, some probation	$75 to $150
12-Panel	10-panel + oxycodone, MDMA/ecstasy	Probation/parole, drug courts, pain management, child custody, strict employers	$100 to $200

Who Uses a 12-Panel Drug Test?

The 12-panel drug test is most commonly ordered by probation and parole officers, drug courts, family courts (child custody disputes), pain management clinics, and employers with zero-tolerance drug-free workplace policies. It is more expensive than the standard 5-panel test used by most employers, so it is typically reserved for situations where comprehensive screening is required. Some rehabilitation programs and sober living homes also use 12-panel tests to monitor residents. If you are on probation, your officer may use a 12-panel or even a custom expanded panel that includes additional substances like EtG (alcohol), tramadol, buprenorphine (Suboxone), or fentanyl.

5-Panel vs. 10-Panel vs. 12-Panel — Which One Will I Get?

The vast majority of pre-employment drug tests use a standard 5-panel test, which covers THC, cocaine, opiates, amphetamines, and PCP. This is also the DOT-mandated panel for safety-sensitive transportation employees. The 10-panel test adds barbiturates, benzodiazepines, methadone, propoxyphene, and methaqualone — it is commonly used for law enforcement, government positions, and some occupational medicine screenings. The 12-panel test adds oxycodone and MDMA to the 10-panel. If you are not sure which panel you will be given, ask the employer, probation officer, or testing facility directly. The test requisition form specifies which panel was ordered.

What If I Have a Prescription?

If you have a valid prescription for a substance that appears on the 12-panel test (such as Adderall, Xanax, Valium, oxycodone, or methadone), you will test positive for that substance. This does not automatically mean you fail. After a positive screen, the results are sent to a Medical Review Officer (MRO) — a licensed physician who reviews the results. The MRO will contact you to verify your prescription. If you provide proof of a valid, current prescription, the MRO will report the result as negative (or 'consistent with prescribed medication'). You should bring your prescription bottle or pharmacy records when you go for testing. The MRO cannot verify prescriptions that are expired, not in your name, or from a prescriber who is not licensed.

Can You Fail for Poppy Seeds?

Yes, eating poppy seeds can cause a positive result on the opiate portion of a 12-panel drug test. Poppy seeds contain trace amounts of codeine and morphine. The federal workplace cutoff for opiates was raised from 300 ng/mL to 2,000 ng/mL in 2010 specifically to reduce poppy seed false positives, but consuming a large amount of poppy seeds (such as multiple poppy seed bagels or pastries) can still exceed even the higher cutoff. If you have a drug test coming up, avoid poppy seed products for at least 3 days before the test. If you test positive and believe it was caused by poppy seeds, inform the MRO — they can order additional confirmation testing.

How the Test Works — Collection and Process

A 12-panel drug test is most commonly performed on a urine sample, though hair and oral fluid options exist. For a urine test, you will go to a collection site (lab, clinic, or employer's office) and provide a sample in a controlled setting. The temperature of the sample is checked immediately to detect substitution. The sample is first screened using an immunoassay (fast, inexpensive), and if any substance tests positive, a confirmation test (GC-MS or LC-MS/MS) is run. Confirmation testing is highly accurate and eliminates most false positives. Results are sent to a Medical Review Officer before being reported to the requesting party.

Frequently Asked Questions

What does a 12-panel drug test test for?: A 12-panel drug test screens for: marijuana (THC), cocaine, opiates (codeine, morphine, heroin), amphetamines (including methamphetamine), PCP, barbiturates, benzodiazepines (Xanax, Valium), methadone, propoxyphene (Darvon — withdrawn from U.S. market), methaqualone (Quaaludes — no longer prescribed in U.S.), oxycodone (OxyContin, Percocet), and MDMA (ecstasy/molly).
Does a 12-panel drug test test for alcohol?: No, a standard 12-panel drug test does not include alcohol. Alcohol testing requires a separate EtG (ethyl glucuronide) urine test, a breathalyzer, or a blood alcohol test. However, some testing facilities offer an expanded 12-panel that adds EtG for alcohol — this is sometimes called a '12-panel plus EtG' or '13-panel' test. If you are on probation, your officer may order EtG testing separately.
Does a 12-panel drug test test for fentanyl?: No, a standard 12-panel drug test does not include fentanyl. Fentanyl is a synthetic opioid that is not detected by standard opiate immunoassays. Testing for fentanyl requires a separate, dedicated fentanyl panel. Some probation offices and drug courts have added fentanyl testing to their screening protocols due to the opioid crisis.
Does a 12-panel test detect Suboxone (buprenorphine)?: No, a standard 12-panel drug test does not detect buprenorphine (Suboxone, Subutex). Buprenorphine is a synthetic opioid that requires its own dedicated immunoassay. Probation officers and drug courts often add a separate buprenorphine panel to the 12-panel test when monitoring individuals in medication-assisted treatment.
How far back does a 12-panel drug test go?: For a urine-based 12-panel test, detection windows range from 1 to 30 days depending on the substance. Most drugs are detectable for 1 to 4 days after last use. Marijuana is the notable exception — heavy daily users may test positive for 30 or more days after stopping. If the test uses hair samples instead of urine, the detection window extends to approximately 90 days for all substances.
What is the difference between a 10-panel and 12-panel drug test?: A 12-panel test includes everything on the 10-panel test plus two additional substances: oxycodone and MDMA (ecstasy). The 10-panel test screens for THC, cocaine, opiates, amphetamines, PCP, barbiturates, benzodiazepines, methadone, propoxyphene, and methaqualone. The 12-panel adds oxycodone (which is not reliably detected by the standard opiate panel) and MDMA.
Can secondhand marijuana smoke cause a positive on a 12-panel test?: It is extremely unlikely under normal conditions. Studies show that secondhand marijuana smoke exposure in well-ventilated areas does not produce enough THC metabolite to exceed standard urine cutoffs (50 ng/mL for screening). However, prolonged exposure in unventilated spaces (hotboxing) could theoretically cause a low-level positive, though this is rare in real-world scenarios.
How long does marijuana stay in your system for a 12-panel test?: For a urine test: single use — 3 to 4 days; moderate use (a few times per week) — 5 to 7 days; daily use — 10 to 15 days; heavy daily use — 15 to 30+ days. Marijuana (THC) is fat-soluble and accumulates in body fat with repeated use, which is why chronic users have much longer detection windows. Body fat percentage, hydration, and metabolism all affect individual detection times.
Does probation use a 12-panel drug test?: Many probation and parole offices use a 12-panel test or an expanded panel. The specific panel varies by jurisdiction, probation officer, and the terms of your supervision. Some probation offices use a standard 12-panel, while others add substances like EtG (alcohol), fentanyl, buprenorphine, or tramadol. Your probation conditions should specify what you will be tested for — ask your officer if you are unsure.

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Take Action — Direct Links

Drug test detection times — full guide
Comprehensive detection window chart for all common substances by test type (urine, hair, saliva, blood)
SAMHSA — Substance Abuse and Mental Health Services Administration
Federal resource for substance abuse treatment and recovery support — call 1-800-662-4357 (free, confidential, 24/7)
Quest Diagnostics — Drug Test Panels
Major testing laboratory with information about available test panels
EtG alcohol test — detection times and false positives
If your test includes alcohol monitoring, learn about EtG detection windows

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Disclaimer: This is informational only, not medical advice. Drug testing procedures, cutoff levels, and detection windows vary by laboratory, test manufacturer, and individual factors. Always consult with a qualified medical professional or Medical Review Officer for advice about your specific situation. For substance abuse support, call SAMHSA at 1-800-662-4357 (free, confidential, 24/7).