General estimates for various marijuana tests are as follows:. Drug tests can detect relatively small quantities of THC, and the amount of THC in a given marijuana cigarette varies.
However, little research has examined exactly how much a person must smoke to fail a drug test. Studies consistently find that frequent weed users are more likely to fail drug tests than infrequent users.
A study in the journal Clinical Chemistry examines marijuana users smoking a single cigarette with 6. Urine concentrations of THC were highest 0. Using a highly sensitive urine test, researchers detected THC in the urine of percent of frequent users and 60— percent of infrequent users. A study reports on testing where hair samples from marijuana users reporting heavy, light, or no use of marijuana. For the study, researchers cut hair into 1-centimeter sections to test for exposure of up to a month prior.
Some 77 percent of heavy users and 39 percent of light users produced positive tests. No non-users had positive test results, suggesting that false positives in hair tests are relatively rare.
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. Some of it is reabsorbed in the blood and broken down.
Its metabolites may remain in the bloodstream for days. According to a review on cannabinoids in oral fluid, weed is detectable in saliva for the following amounts of time after last use:. Weed can enter the saliva through smoking and exposure to smoke.
However, its metabolites are only present in saliva when weed has been smoked or ingested. Hair follicle tests assess drug use for up to 90 days. After use, weed reaches the hair follicles via small blood vessels. Trace amounts may remain in the hair. Since hair grows approximately 0. The active ingredient in weed is a chemical substance called THC, which stands for deltatetrahydrocannabinol. THC that enters your body is absorbed into the bloodstream. Some THC is temporarily stored in organs and fatty tissues.
In the kidneys, THC can be reabsorbed into the bloodstream. THC is broken down in the liver. Drug tests look for these metabolites, which stay in your body longer than THC. Eventually, THC and its metabolites are excreted in urine and stool. A number of factors affect how long weed stays in your system.
Other factors are related to weed and how you use it. This includes how much you take dose and how often frequency. Higher doses and more frequent use tend to increase the amount of time it takes to eliminate weed from your system. Despite this, a positive test result could be a cause for concern and be used to help a person get help with marijuana addiction. Nearly three out of ten people who use marijuana have a marijuana use disorder.
A marijuana use disorder can cause cognitive problems, an increased risk of heart attack, impair brain development and lead to risky behaviors. In certain cases, a person may be able to overcome an addiction to marijuana on their own, or in an outpatient treatment program. However, after experiencing the toll of addiction on their life and health, some people may prefer an inpatient drug rehab program.
Marijuana treatment programs may use therapies or counseling to help a person build sober living skills so that they can live a more fulfilling, sober life. Contact Vertava Health at for more information on marijuana abuse, addiction, and treatment. This page does not provide medical advice. Don't Wait. Get Help Now Medically reviewed by Dr.
Gerardo Sison, Pharm. D Revised on August 16, Factors That Influence Marijuana Detection Times The amount or dose a person smokes or otherwise uses can alter the time the drug remains in their system. In addition to these, other factors can affect marijuana detection times: The Type of Marijuana Can Affect Marijuana Detection Times The amount of THC, the component in marijuana responsible for the high, can vary widely between different strains of marijuana.
How to Test Sensitivity Can Impact Marijuana Detection Times A drug test has a cutoff concentration cutoff level , or the point at which testing begins to trace amounts of a drug or its metabolites. How to Test Specificity Can Influence Marijuana Detection Times When a greater number of cannabinoid metabolites can be detected, a test is considered to be less specific. Using Do-It-Yourself Marijuana Detoxes Or Flushes To Pass A Test While some people will attempt to at-home marijuana detoxes or flushes to cleanse the drug out of their system, marijuana may still be present during testing.
Questions About Treatment? The short-term effects of marijuana on memory, learning, problem-solving, and coordination last for one to two hours, with some lingering effects for up to 24 hours.
It's been shown to impair your driving performance for up to three hours, according to the National Highway Safety Administration. The effects of marijuana are also influenced by the terpene profiles of a given strain. For instance, citrus terpene profiles tend to be more stimulating, which may be the desired effect, or may contribute to someone feeling anxious.
It is important to know that not all marijuana is created equal. Unlike other prescription drugs, marijuana products aren't standardized and can vary considerably in quality, makeup, and dosage. This variance may contribute to how quickly you feel the effects and what those effects are.
THC can interact with alcohol, blood thinners, and anti-anxiety medications , so it's important to discuss your marijuana use with your doctor. The half-life of marijuana is how long it takes for half of the drug to be metabolized and eliminated from the bloodstream. While there are many different cannabinoids, THC is the one most drug tests are looking for. THC is rapidly broken down and modified into molecules known as metabolites. At least 80 different metabolites are formed from THC and may have their own effects on the body's endocannabinoid system.
These metabolites are stored in body fat and are gradually eliminated from the body through feces and urine. Some THC metabolites have an elimination half-life of 20 hours whereas others are stored in body fat and have an elimination half-life of 10 to 13 days.
It takes five to six half-lives for a substance to be almost entirely eliminated. This is why you see advice that one-time use is probably not detectable after five to eight days. Because marijuana stays in the bloodstream for only a short time, blood tests for marijuana are usually not used.
The exceptions are in the case of automobile accidents and some roadside sobriety checkpoints. Blood or saliva tests can show current intoxication. However, unlike blood alcohol concentration tests, they do not indicate a level of intoxication or impairment. Daily or near-daily cannabis consumption is likely, but not always, detectable by a hair test up to three months later. But, the hair test is not reliably able to detect infrequent cannabis use or determine the amount of cannabis used.
Urine tests for marijuana metabolites also only show recent marijuana use, not current intoxication or impairment. This is because of the time required between use and your body breaking down THC to the metabolites that are eliminated in the urine. Because many employers have a zero-tolerance for drug use, most workplaces use urine tests to detect recent use of drugs. If positive results are returned, the sample is again screened with a gas chromatograph-mass spectrometer GCMS , which is much more accurate and so false positives are rare.
At one time, ibuprofen sold over-the-counter as Advil, Motrin, and Nuprin would cause false marijuana positives. But today's tests have been adjusted to eliminate that problem.
In places where marijuana is legal, roadside blood tests have been known to show some false positives in people who had been legally consuming cannabis but were not actively intoxicated at the time of the test. A report detailed a Belgian policy of testing oral fluid at the roadside that found it decreased these types of false positives.
The length of time marijuana remains in your body depends on many different factors, including frequency of use, body mass, metabolism, sex, and hydration levels.
There is some evidence that the length of time that marijuana remains in the body is affected by how often the person uses marijuana, how much they use, and how long they have been using.
People who use marijuana regularly have reported positive drug test results after 45 days since last use, and people who use more heavily have reported positive tests up to 90 days after quitting.
Women often metabolize THC at a slightly slower rate since they tend to have higher levels of body fat than male counterparts. The faster your metabolism, which can be impacted by age, physical activity, and certain health conditions, the faster marijuana will exit your body. THC metabolites are often stored in the fat cells in your body, so the higher your body fat or BMI , the slower you'll likely be able to metabolize and excrete marijuana.
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