Most drug testing programs use two kinds of tests: fast, low-cost instant tests to screen, and laboratory tests to confirm. Knowing what each one does helps you build a program that is both affordable and fair.
Side-by-side comparison
| Instant (rapid) test | Laboratory test | |
|---|---|---|
| How it works | Immunoassay strips in a cup or dip strip | Immunoassay screen, then GC/MS or LC-MS/MS confirmation |
| Time to result | About 5 minutes | Usually 1 to 3 business days |
| Cost per test | Low, especially in bulk | Much higher |
| Result type | Preliminary positive or negative | Confirmed result naming the exact substance |
| Equipment | None | Certified laboratory |
| Best for | Frequent, on-site screening | Confirming positives, legal and federally required tests |
How accurate are instant tests?
Quality instant tests are highly accurate at detecting whether a substance is above the cutoff level. Their limitation is specificity: an immunoassay can occasionally react to a related compound, such as certain medications, and it cannot tell you exactly which substance caused the result. That is why a preliminary positive should always be confirmed by a lab before action is taken.
When to use an instant test
- Random and frequent testing in sober living homes and treatment programs
- Non-DOT pre-employment and workplace screening
- Any time you need an answer during the same visit
When you need a lab test
- Confirming a preliminary positive before an employment, housing or treatment decision
- Federally mandated DOT testing, which must be processed by a certified lab
- Detecting substances instant tests miss, or identifying the exact medication
- Legal and court-ordered testing that requires chain of custody
The most cost-effective approach
Screen everyone with instant tests, then send only the preliminary positives (and any disputed results) to a lab. Because most results are negative, this keeps lab costs to a small fraction of what testing every sample at a lab would cost, while still giving every positive a confirmed answer.
Ordering for a house, program or company?
Volume pricing starts at 25 units and gets better at 50, 75 and 100. For standing orders or 500+ units, call (866) 407-2832 or email sales@drugtestsdirect.com for a quote.
Request a Bulk QuoteFrequently asked questions
Are instant drug tests as accurate as lab tests?
They are accurate for screening, but they give preliminary results. Lab tests confirm the exact substance and are the standard for final decisions.
How long do lab drug test results take?
Usually 1 to 3 business days, longer if a sample needs confirmation testing.
Can instant drug tests be used for DOT testing?
No. DOT-required tests must be processed by a certified laboratory.
Should every positive be sent to a lab?
Yes, before any serious action is taken, especially if the person disputes the result or has a relevant prescription.
Related guides
Instant urine tests give preliminary results. Confirm any preliminary positive with a laboratory test (such as GC/MS) before taking action. Always follow the package insert.