A single 5mg edible can stay detectable in your system for roughly 1 to 10 days in urine, depending on how often you use cannabis. If this was a one-time or rare occurrence, you’re looking at the shorter end of that range. If you use cannabis regularly, the detection window stretches significantly longer because THC builds up in your body over time.
The exact timeline depends on which type of test you’re facing, your metabolism, your body fat percentage, and your usage history. Here’s what to expect for each.
Why Edibles Linger Longer Than Smoking
When you eat a 5mg edible, your liver processes the THC before it reaches your bloodstream. This is called first-pass metabolism, and it converts THC into a different compound that crosses into the brain more efficiently and is estimated to be three to four times more potent than the THC you’d inhale from smoking. That’s why a 5mg edible can feel stronger than you’d expect from such a small dose.
This liver processing also means THC enters your blood more slowly and takes longer to peak. After eating an edible, the main metabolite that drug tests look for (a breakdown product called THC-COOH) reaches its highest concentration in urine about 9 hours after ingestion. Compare that to smoking, where peak blood levels hit within minutes. The slower, more drawn-out metabolism of edibles means the detectable byproducts stick around longer in your body.
Urine Tests: The Most Common Scenario
Standard urine drug screens look for THC-COOH, and the initial screening threshold is 50 ng/mL. If a sample triggers that initial screen, a confirmation test with a lower cutoff of 15 ng/mL is used to verify the result.
For a casual or one-time user, THC-COOH from a single 5mg edible will typically clear urine within 3 to 10 days. Research on oral cannabis doses of 10mg and higher found detection windows up to 94 hours (about 4 days) for THC-COOH in controlled settings. A 5mg dose is half or less of what was used in those studies, so the window for a single use is likely on the shorter side, potentially 2 to 5 days for most people.
If you use cannabis regularly, even small doses accumulate. THC is fat-soluble, meaning it gets stored in fat tissue and released slowly over time. Regular users can test positive for 2 to 4 weeks after stopping, and heavy daily users sometimes test positive for over a month. THC-COOH has an average elimination half-life of about 30 hours, but in frequent users, that half-life can be considerably longer because of accumulated stores in body fat.
Blood and Saliva Tests
Blood tests have a much narrower detection window. THC is typically detectable in blood for 2 to 12 hours after a single use. Because edibles take longer to absorb, THC may appear in your blood a bit later (peaking around 1 to 3 hours after eating) and linger slightly longer than after smoking, but it still generally clears within 24 hours for a one-time dose.
Saliva (oral fluid) tests are increasingly common for roadside and workplace screening. The federal cutoff for THC in oral fluid is 4 ng/mL for the initial screen, dropping to 2 ng/mL for confirmation. Cleveland Clinic estimates cannabis is detectable in saliva for up to 24 hours after use. For frequent users, some research has found THC in oral fluid up to 72 hours later, but a single 5mg edible in an occasional user would likely clear saliva within a day.
Factors That Shift Your Timeline
The numbers above are averages. Several variables can push your personal detection window shorter or longer:
- Usage frequency is the single biggest factor. A truly one-time user clears THC far faster than someone who uses weekly or daily, because there’s no accumulated THC stored in fat.
- Body fat percentage matters because THC-COOH is fat-soluble. People with higher body fat tend to store more and release it more slowly.
- Metabolism and hydration play a role. A faster metabolism breaks down and excretes THC byproducts more quickly. Being well-hydrated can dilute urine concentrations, though extremely dilute samples may be flagged and require retesting.
- Exercise can temporarily increase THC-COOH levels in urine by mobilizing fat stores, which is worth knowing if you’re close to a test date.
How 5mg Compares to Larger Doses
A 5mg edible is considered a standard low dose in most regulated cannabis markets. In controlled research, participants who ingested 10 to 50mg of THC in edible form showed maximum urine concentrations of THC-COOH ranging from 107 to 713 ng/mL, with higher doses producing higher peaks and longer detection windows. At 5mg, you’re below the lowest dose studied in most research, which means your peak metabolite concentration will be lower and your clearance time shorter.
For a one-time or infrequent user taking a single 5mg edible, a reasonable estimate is 1 to 3 days for blood and saliva, and 3 to 6 days for urine. If you’ve used cannabis multiple times in recent weeks, add several days to those estimates. And if you’re a daily user, even a 5mg dose is adding to an existing reservoir that could take weeks to fully clear.
Hair Tests Are a Different Story
Hair follicle tests can detect cannabis use for up to 90 days, regardless of dose size. THC metabolites get incorporated into the hair shaft as it grows, creating a long-term record. However, a single 5mg edible may not produce enough metabolite to reliably trigger a hair test, especially since hair tests are better at detecting repeated use patterns than isolated low-dose events. That said, there’s no guarantee a one-time use won’t show up, and hair test sensitivity varies between labs.