The core difference: detection window
| Test type | Approximate detection window |
|---|---|
| Urine test | Recent use — roughly the past 1–4 days (up to ~30 days for heavy marijuana use) |
| Hair follicle test | Long-term pattern — up to about 90 days |
A urine test is the everyday standard: fast, inexpensive, and great for recent use or a specific event. A hair follicle test can't detect last night's use, but it reveals a pattern over roughly three months — which is why it's chosen when the long view matters.
How they compare
- Speed & cost — urine wins: rapid results and lower price
- Look-back window — hair wins: up to ~90 days vs. a few days
- Recent use — urine wins: hair typically can't catch the last few days
- Hard to cheat — hair is difficult to tamper with; observed collection helps urine too
- Court preference — depends on the question; courts sometimes specify one
Which should you choose
Choose urine for pre-employment, random testing, court deadlines, and any 'are they using now' question. Choose hair when you need to establish a longer history — common in custody cases, some court orders, and certain safety-sensitive hiring. If a court or employer specified a method, follow that; if not, we'll help you match the window to your goal.
Can you do both?
Yes — in some situations (especially custody or disputed cases) people run both to cover recent use and long-term pattern. We can collect both in one visit and send everything to SAMHSA-certified labs.