5 Panel Drug Test: How Does It Work, What It Catches and What Happens to Your Sample

Updated 15 Oct 2026 · By the DrugTestAnswers editorial team

If your offer letter says "5-panel drug screen," here's the deal in plain English. It's the most common basic test in America, it looks for five drug classes in your urine, and it works in two stages: a quick screen, then a lab confirmation if anything looks off. Here's what happens, step by step, so nothing surprises you.

The five panels

The classic 5-panel test mirrors what federal workplace programs have checked for decades:

1. Marijuana (THC), measured as the metabolite THC-COOH.
2. Cocaine, measured as benzoylecgonine.
3. Amphetamines, including methamphetamine and MDMA in many versions, which also catches Adderall.
4. Opiates, mainly codeine and morphine (heroin breaks down into morphine).
5. PCP (phencyclidine).

Some newer 5-panels swap PCP for something else, and many employers now order extended opioid panels that include oxycodone, hydrocodone and fentanyl. Always assume the employer's version, not the textbook one.

Stage one: the screening test

The screen is an immunoassay. In plain terms, it uses antibodies designed to latch onto a particular drug or metabolite. On an instant cup or dip card, each panel strip contains those antibodies plus a dye. Here's the counter-intuitive part:

• A line showing in the test (T) region means negative. The drug wasn't there in a high enough amount to block the line.
• No line in the T region means non-negative (a presumptive positive).
• The control (C) line must always appear, or the test is invalid.

Even a faint T line usually counts as negative. Lab screens work on the same principle but use automated analyzers that give a number instead of a line.

Cutoffs decide "positive"

Every panel has a cutoff concentration. Below it, the result is negative even if some drug is present. Federal urine screening cutoffs (which most labs copy) are 50 ng/mL for THC, 150 for cocaine, 2,000 for codeine and morphine, 500 for amphetamines and 25 for PCP. See the full list on our cutoff levels page. Cheap home cups sometimes use more sensitive cutoffs, like 20 ng/mL for THC.

Stage two: confirmation

If a lab screen comes back non-negative, the same sample is retested using GC-MS or LC-MS/MS, which identifies the exact molecule and measures it precisely. Confirmation cutoffs are lower (15 ng/mL for THC, for example) because the method is more specific. This step is what weeds out false positives from things like cold medicine or certain antibiotics.

With instant on-site cups, a non-negative result is usually sent to a lab for confirmation before an employer acts on it. In regulated programs, a Medical Review Officer (a physician) then calls you to ask about prescriptions.

What happens at the collection site

1. You show ID and sign a chain-of-custody form.
2. You leave bags and jackets outside and wash your hands. The water may be dyed blue and the tap taped off.
3. You provide about 45 mL of urine (roughly a third of a cup).
4. The collector checks temperature within four minutes and seals the sample with tamper-evident tape you initial.
5. The sample ships to a lab or, for an instant test, is read on the spot.

Validity checks

Labs don't just look for drugs. They check that the sample is real, fresh and undiluted: temperature, creatinine, specific gravity, pH and oxidizing chemicals. A sample can come back as dilute, adulterated, substituted or invalid. Employers often treat those as a fail or a refusal, so drinking a gallon of water right before a test tends to backfire.

How long does each drug show up?

Source: Moeller et al., Mayo Clinic Proceedings 2017. Use our detection window calculator for more detail.

How long do results take?

Instant cups read in about 5 minutes. A negative lab screen typically comes back in 24-48 hours. A non-negative that goes to confirmation and MRO review can take 3-5 business days, sometimes longer if the MRO can't reach you. If your result is "taking a while," that's often just a dilute sample or a prescription check, not necessarily bad news.

What a 5-panel does NOT catch

Alcohol, benzodiazepines (Xanax, Klonopin), barbiturates, most synthetic opioids unless added, kratom, K2/spice and nicotine are not on a standard 5-panel. For those, employers need a bigger panel or a specific add-on.

Test yourself first

The smartest cheap move before any screen is a home 5-panel dip test. It uses the same immunoassay technology as the screening stage, so you'll know where you stand. Check the cutoffs on the box match the lab's if you want an apples-to-apples read.

5-panel vs 10-panel vs 12-panel

Bigger panels just add drug classes to the same cup. A 10-panel usually adds benzodiazepines, barbiturates, methadone, propoxyphene or oxycodone, and sometimes MDMA. A 12-panel tacks on a couple more, often oxycodone and buprenorphine. The process, the cutoffs for the shared drugs and the confirmation steps are the same. The employer simply pays for more strips or more lab analytes. If you're not sure which one you're getting, it's fine to ask HR or the collection site; they'll often tell you the panel size even if they don't list every drug.

Your rights if a result looks wrong

If you're told you failed and you know you're clean, ask whether the result was confirmed by GC-MS or LC-MS and whether a Medical Review Officer reviewed it. In many programs you can request that a split sample be tested at a second lab. Keep a list of every prescription, over-the-counter medicine and supplement you took in the week before the test, because that's exactly what the MRO will ask about.