More sensitive tests can detect lower doses of marijuana. Tests include blood, urine, hair, and saliva. Marijuana drug tests look for THC, not marijuana. So the amount of THC that a person consumes is the significant factor.
The effects of THC are cumulative. This means that a person who smokes several times over several days has consumed a higher THC dose than someone who smokes once, and so they are more likely to test positive. The strength of each dose of THC also matters. Without sensitive laboratory equipment, a person cannot reliably determine the strength of their marijuana.
Since fat stores marijuana, people with higher body fat concentrations may metabolize marijuana more slowly than a person with less body fat.
Body mass index BMI is one way to judge body fat. Typically, females have more body fat than males. This means that females may metabolize marijuana slightly more slowly. Dehydration increases concentrations of THC in the body. While drinking lots of water is unlikely to affect a drug test significantly, severe dehydration might. Exercise will not significantly change the rate at which the body metabolizes THC.
Exercising before a drug test, however, might. A small study of 14 regular marijuana users assesses the effects of 35 minutes of exercise on a stationary bike. The results conclude that THC concentrations increased by a statistically significant amount, suggesting that exercise right before a drug test may increase the likelihood of a positive test result.
The researchers believe that exercise may cause fat cells to release THC. For a drug test to be negative, the body must eliminate THC from the system, as well as metabolic chemicals that have links to THC. People with faster metabolisms typically eliminate THC more quickly than those with slower metabolisms.
Ultimately, there are only two strategies that work for this, and they are decreasing the concentration of THC in the marijuana and speeding up the metabolism. Proper hydration can prevent a drug test from showing unusually high THC concentrations. For people whose test results are on the border of positive and negative, this means that being dehydrated may increase the chances of a positive result.
There is no reliable way to speed up the metabolism. Marijuana drug tests measure the presence of either THC or THC by-products in your bodily fluids or hair, but how long after consumption a test can detect them depends on the specific type of test:.
Urine testing is the most common drug testing method. THC byproducts can be detected in urine for the following amounts of time :. THC content in blood quickly peaks within the first few minutes of smoking weed and then declines within an hour. But if you consume your weed in edible form, you can expect your blood THC content to peak around 3 hours after consumption.
However, studies show some frequent marijuana users' blood will test positive even after seven days of abstinence. Saliva testing is common in workplaces and uses a swab placed between the lower cheek and gum. Saliva tests can detect marijuana for up to 24 hours after last consumption in infrequent cannabis users, and up to 30 hours in regular and chronic users.
Hair follicle testing has the longest detection window, or the period weed can be detected after last use. Hair follicle tests can detect weed for up to 90 days after last consumption , for most users. User frequency. Hair follicle test. Experts agree the only way to get weed out of your system is to stop using it.
And, if you're a chronic smoker, you're likely in for a waiting game. There are plenty of products on the market claiming they can speed up the weed "detox" process, but these claims are unproven and the products can cause dangerous side effects. Drinking water, eating healthy, or "sweating it out" will not remove weed from your system. Patience is the name of the game when it comes to clearing weed out of your system, and regular marijuana users taking urine tests will likely test positive for weeks longer than less frequent users.
If you find that you can't handle symptoms of withdrawal without relapsing, you may be at risk for a substance use disorder. Do not be afraid to seek out professional support from a mental health professional. There are therapists who can help you understand your reasons for using. They also can help you determine how cannabis use is impacting your life, and how to develop a plan to stop using if that ends up being the best choice for you. For more mental health resources, see our National Helpline Database.
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Associations between butane hash oil use and cannabis-related problems. Drug and Alcohol Dependence. Learn About Marijuana Risks. Updated September 26, Your Privacy Rights. To change or withdraw your consent choices for VerywellMind. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page. These choices will be signaled globally to our partners and will not affect browsing data.
We and our partners process data to: Actively scan device characteristics for identification. I Accept Show Purposes. Table of Contents View All. Table of Contents. Detection Times. Symptoms of Overdose. Getting Help. What to Know About Marijuana Use. No known substances would cause a marijuana urine test to return a false positive. Can You Overdose on Marijuana? Was this page helpful? Thanks for your feedback! Sign Up. What are your concerns?
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