How long does marijuana show up on a blood test?

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Answer by A Chemist Who Knows
Submitted on 8/5/2006
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Drug tests detect drugs as well as metabolites. Metabolites are the byproducts of a substance after it has run through your system. To determine whether you will pass or not, it is important to know how much of the illicit metabolites are in your urine or blood and how much is tested for. Usually, they test for the fat-soluble metabolite TetraHydraCannabinol. The halflife of THC concentration ranges between 0.8 to 9.8 days. There is too much human variation to even approximate how long THC will be detected in the urine or blood of an individual. Infrequent users with a fast metabolism will have the shortest detection time. Frequent users with a slow metabolism will have long detection times. The only way to estimate a detection time is to consider the lower and upper bounds (3-30 days), and decide based on the factors I've mentioned.

Answer by nav
Submitted on 2/1/2007
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While marijuana itself does not actually stay in the body, some of the chemicals in the drug do. THC (delta-9-tetrahydrocannabinol), the substance in pot that's mainly responsible for people's high, may stay in the body forever � scientists aren't exactly sure. However, THC is only detectable for a certain period of time after using marijuana or being exposed to marijuana smoke. Compared to other controlled substances, THC is able to stay in a person's system for a relatively long period of time because it is fat-soluble. Being fat-soluble allows it to be stored in fatty tissues of various organs. From here, THC is slowly released and metabolized. This metabolite of THC is then excreted and cleared from a person's system. In testing to see if someone has recently used pot, there are two important substances to keep in mind: THC and 9-carboxy-THC. 9-carboxy-THC is a product of the body's metabolism of THC and, more importantly, it is detectable for a longer period of time than THC is detectable. This is the reason that drug tests, namely urine tests, look for 9-carboxy-THC. Many of the following numbers are estimates. The actual amount of time that these substances are detectable in a person's body depends on several factors, including how much pot is used, how often a person uses it, and the rate of his/her metabolism of the substance. Typical Periods of Time that Marijuana Use can be Detected� Blood Tests Urine Tests THC 9-carboxy-THC 9-carboxy-THC Frequent Users* 4 - 8 hours 2 or more weeks 2 weeks � 1 month� Infrequent Users** 3 - 4 hours 2 - 3 days Up to 10 days � Some private companies may use hair tests to detect possible marijuana use. Positive hair test results have been found to be unreliable. * Frequent users are defined as people who use marijuana several times per week, if not more often. ** Infrequent users are those who use marijuana seldom enough that THC and/or its metabolite are no longer detectable before their next use. In essence, these users do not use pot often enough to allow for the tested substances to build-up from one use to another. � The detection period for 9-carboxy-THC in urine can be as long as 3 months in extremely heavy users. On a final note, it's interesting that this question is brought up since these types of questions typically arise from some specific concern. People usually ask this question when they are worried about being tested by an employer. If this is the case, then maybe it is time to carefully weigh marijuana use against: (1) the consequences of being suspended or losing a job, and (2) the health risks associated with using marijuana.

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Question by sll
Submitted on 4/8/2004
Related FAQ: alt.hemp CANNABIS/MARIJUANA FAQ
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How long does marijuana show up on a blood test?

Answer by silly
Submitted on 6/1/2004
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three days

Answer by Fish
Submitted on 7/13/2004
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if you toke daily, it can show up for up to 4 weeks though

Answer by Ian
Submitted on 8/17/2004
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I am looking on different websites for an answer and some sites say it can easily be detected 11 weeks after smoking a joint...

Answer by Al
Submitted on 9/12/2004
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Will my doctor be able to tell that i smoke weed when he looks at my blood test results?

Answer by tokemaster
Submitted on 3/14/2005
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three days it stays in your urine. Life in your blood. (small traces if u haven't smoked in a while)

Answer by adam
Submitted on 3/16/2005
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it takes 31 days for marijuana to come out of your system completly if u smoke 24/7

Answer by pookey
Submitted on 4/6/2005
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40 days

Answer by gbcsblz
Submitted on 5/19/2005
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sttop smokin' weed man!

Answer by cah
Submitted on 8/28/2005
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it stays in your system for 31 days, it's in the fatty tissue so the more fat you have the longer it stays..if you are thin and don't have much fat drink alot of water and it flushes it out of your system

Answer by fast eddie
Submitted on 10/8/2005
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ha ha ha you lose loser

Answer by joseph
Submitted on 10/27/2005
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marijuana or bhang can act on you for seven good years that is you can test positive for good seven years after you stop taking marijuana and I dont see anything wrong with that infact it's God given weed and it's only difference from other weeds is only that its holly so I am advising any government that keeps on harassing the smokers to stop and declare it legal infact they loose so much tax on it lets allow B.A.T to manufacture it as their other alternative and stop producing cigarretes.

Answer by Mao
Submitted on 11/11/2005
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A brand new store has opened and they have the lowest prices on the internet for the products that help <a href="http://www.drugtestingexpert.com/">you pass any drug test</a>! Whether its saliva or hair or urine test, or even a blood test, they have a solution for you to pass it. Just visit their website today. http://www.drugtestingexpert.com/

Answer by aron marroquin
Submitted on 11/22/2005
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Answer by phead
Submitted on 1/6/2006
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this is a question if you smoke pot for one night will it show in your blood test a week after?

Answer by AYUDA
Submitted on 4/12/2006
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MARIJUANA STAYS IN YOUR BLOOD/ BODY FOR A PERIOD OF 30 DAYS FROM THE LAST DAY USED, THE RESIDUE FROM MARIJUANA WHEN SMOKED IN A ROOM, STICKS TO THE CEILING & WALLS AND IS PRESENT FOR APROXAMITLY. 3O DAYS.

Answer by LILMAMMA31
Submitted on 8/17/2006
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IF U SMOKED EVERYDAY IT REALLY TAKES ABOUT 2 MONTHS.TRUST ME I SHOULD KNOW.

Answer by Ace
Submitted on 1/24/2006
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2 months if you toke daily my friend.

Answer by Jayme
Submitted on 2/9/2006
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Try drinking vinegar to flush your system, it works :)

Answer by wood
Submitted on 2/22/2006
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28 days

Answer by Qps
Submitted on 2/27/2006
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Hrmm blood test friday, smoke today(monday)? lol.

Answer by dude
Submitted on 3/1/2006
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i heard it stayed in there for 30 days

Answer by Jee jee
Submitted on 3/4/2006
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Marijuana stays in your blood for 22 hours. and in your urine for 3-4 days if you are an occasional user If you smoke once a week.

Answer by maggie
Submitted on 3/15/2006
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more like 28 days.....

Answer by D-Boy
Submitted on 3/30/2006
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Let me set the record straight if you smoke everrry day then it can take up to 60 days to get out of your system, NOW in your blood it stays up to 3 months also your hair can be tested as well and its 3 months also

Answer by amnesiac
Submitted on 4/6/2006
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THC is not water soluble, so since it has to have somewhere to go it is absorbed in your fat, meaning that it actually stays in your system in the form of THC metabolites for probably longer than you think. 25-27 days is the average amount of time until your system is "clean," but as for how long it will show up on a drug test, I don't know. There are ways to pass, especially if it is a urine test. Just do a google search...

Answer by rora
Submitted on 5/7/2006
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if u know you're gonna take a blood test stop smoking it for a least a week before you have to take it, it shouldn't show up.

Answer by J.D.O
Submitted on 5/25/2006
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But why would you want to take marijuana?

Answer by amanda
Submitted on 6/13/2006
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i used to smoke daily but its been three weeks since ive smoked. ive got a blood test in a couple days do you think i can pass??

Answer by joe
Submitted on 6/16/2006
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cant mary-jane show up on a urine test

Answer by camper
Submitted on 6/17/2006
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cool

Answer by Erika
Submitted on 9/14/2006
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your burnt it stays off your system in a mouth...........

Answer by Wes
Submitted on 9/29/2006
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I smoked weed on the 8th of September ,and I had a siliva test on the 28th of september.Will i Pass the drug test?

Answer by hellboy
Submitted on 11/2/2006
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hi last weekend i smoked a bit like only a cone and like 4 days later i needed a blood test it wasent a drug test they were checking for something thats makeing me sic will pot show up on that test

Answer by rtracymd
Submitted on 12/5/2006
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3 months! Yep!... 3 months!

Answer by drugaddict
Submitted on 1/15/2007
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i like cannabis

Answer by Pana
Submitted on 3/4/2007
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I think is around three days. Thanks God.