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How long is THC detectable in the body?
- , by Noah van Knippenberg
- 7 min reading time
Cannabis use can remain detectable for anywhere from a few hours to several months, depending on the type of test used. THC itself is usually detectable for a relatively short period, while metabolites such as THC-COOH and traces found in hair can remain detectable much longer.
How long cannabis stays detectable also depends on how much and how often a person uses it, as well as what the test is designed to detect. Some tests look for THC itself, while others detect metabolites such as THC-COOH. This means THC may no longer be detectable in a standard blood test, while a urine or hair test may still show evidence of earlier cannabis use.
How long is THC detectable?
The detection window for cannabis can range from a few hours to several months. The biggest differences are caused by the type of test and the substance the test is designed to detect.
| Test | What is detected? | Approximate detection window |
|---|---|---|
| Blood test | THC | About 4 to 24 hours |
| Saliva test | Recent cannabis use | About 6 to 14 hours |
| Urine test | Mainly metabolites such as THC-COOH | About 5 to 30 days |
| Hair test | Traces of previous cannabis use | Reliably detectable for up to about 3 months |
| Blood test for THC-COOH | THC-COOH | Several days to around 2 months |
These timeframes are general guidelines. How long cannabis remains detectable varies from person to person and depends on factors such as the amount consumed, frequency of use and the type of test.
How long does THC stay in your blood?
THC may be detectable in the blood for roughly 4 to 24 hours after cannabis use. After smoking a single joint, the detection window is often around 6 to 8 hours. With daily or frequent cannabis use, THC may remain detectable for 24 hours or sometimes longer. After consuming cannabis in the form of edibles, such as space cake, THC may also remain detectable in the blood for more than 24 hours.
Blood tests are mainly useful for detecting relatively recent cannabis use. When cannabis is smoked, THC quickly enters the bloodstream through the lungs. With edibles, it is absorbed through the digestive system. From the bloodstream, THC is then distributed throughout the body.
Because THC is fat-soluble, some of it is transferred from the blood into fatty tissue. This transfer happens relatively quickly, while the release of cannabis-related compounds from fatty tissue back into the bloodstream happens much more slowly. However, this does not mean that a standard blood test will remain positive for several days. THC levels in the blood drop significantly after use, although small amounts of cannabis compounds may continue to be released from fatty tissue over a longer period.
Blood tests for THC-COOH
Blood tests can also detect THC-COOH, a metabolite produced when the body breaks down THC. THC-COOH remains detectable much longer than THC itself. Depending on how much and how often cannabis has been used, THC-COOH may remain detectable in the blood for several days to around two months.
THC-COOH levels are influenced by both the amount and frequency of cannabis use. People who use cannabis frequently or in larger amounts generally have higher levels. A positive THC-COOH result does not automatically mean that someone is still under the effects of cannabis at that moment.
How long is THC detectable in saliva?
THC may be detectable in saliva for around 6 to 14 hours after cannabis use. For people who use cannabis frequently or in larger quantities, this period may be longer. Saliva tests are therefore mainly suited to detecting relatively recent cannabis use.
The condition of a person's teeth and mouth may also affect the result. Cannabis residue can sometimes remain between the teeth or around the gums and later mix with saliva.
How long is cannabis detectable in urine?
Cannabis use may be detectable in urine for around 5 to 30 days. After smoking a single joint, a urine test may remain positive for about five days. People who use cannabis frequently or in larger amounts may continue to test positive for more than 30 days.
There are two main reasons why cannabis can be detected in urine much longer than THC can usually be detected in the blood. First, urine tests generally do not look for active THC, but for metabolites such as THC-COOH. Second, THC is fat-soluble, meaning some cannabis-related compounds are stored in fatty tissue and gradually released over time.
The body continues to process these substances, producing metabolites such as THC-COOH. These metabolites are eventually excreted in urine and may remain detectable for an extended period.
How long is cannabis detectable in hair?
Hair tests can detect cannabis use for up to around three months. In some cases, traces of cannabis use from even further back may still be found. In practice, however, hair tests are used much less frequently than blood, urine or saliva tests.
Why does cannabis remain detectable for so long?
THC's fat-soluble nature is one of the main reasons cannabis and its metabolites can remain detectable in the body for a relatively long time. THC moves from the bloodstream into fatty tissue fairly quickly. From there, cannabis-related compounds are released much more slowly. The body continues to break these substances down, producing metabolites such as THC-COOH.
This is especially relevant for people who use cannabis regularly. Frequent users repeatedly introduce new THC into the body while compounds from earlier use may still be released from fatty tissue. As a result, metabolites in particular can remain detectable for much longer. This is especially noticeable with urine tests, which generally have a much longer detection window than standard blood tests for THC.
What affects how long THC stays detectable?
How long THC and its metabolites remain detectable mainly depends on how much cannabis is consumed, how often it is used, individual physical differences and the type of test.
- Frequency of use: With daily or regular cannabis use, THC and its metabolites may remain detectable longer than after one-time use.
- Amount consumed: The more cannabis a person uses, the more THC the body needs to process and break down.
- Body fat: THC is fat-soluble, and cannabis-related compounds can gradually be released from fatty tissue. A person's body fat percentage may therefore affect how long these compounds remain detectable.
- Type of test: Blood and saliva tests are mainly suited to detecting recent use, while urine and hair tests can cover a much longer period.
Two people who use the same amount of cannabis at the same time may therefore not test positive for exactly the same length of time.
Are you still high as long as cannabis is detectable?
No. Detectability and the duration of cannabis effects are two different things. The noticeable effects of cannabis generally last around 2 to 8 hours, depending on how it is consumed. For example, the duration may differ between smoking, vaping and consuming edibles.
A positive drug test therefore does not automatically mean that someone is still experiencing the effects of cannabis. Likewise, the detection window of a test cannot be used as an exact measure of how long someone remains under the influence.
Can you get THC out of your system faster?
There is no reliable method for quickly removing THC or its metabolites from the body. Drinking large amounts of water, for example, does not make cannabis disappear from urine faster.
Drinking excessive amounts of fluid may simply dilute the urine. In some types of testing, unusually diluted urine can be detected by looking at certain values in the sample. Ultimately, the body needs time to process and eliminate THC and its metabolites naturally. Drinking extremely large amounts of water can also be harmful to your health.
Can CBD cause a positive THC test?
CBD itself is unlikely to cause a positive THC test. However, some CBD products may contain small amounts of THC. This is particularly possible with products that contain several naturally occurring compounds from the cannabis plant. If the THC content is high enough, it may potentially affect the result of a drug test.
HHC, THCP and other cannabinoids with a chemical structure similar to THC may also potentially affect certain cannabis tests.
Noah van Knippenberg
Content Specialist Novus Fumus
Noah van Knippenberg writes for Novus Fumus about cultivation techniques, mushrooms, and smartshop-related topics. Drawing from his practical experience, he translates complex subjects into accessible and reliable information.
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