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Thread: How long does weed stay in your blood?

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    New Member John Jones's Avatar
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    Question How long does weed stay in your blood?

    Just need to know how long that weed stays in your blood if you smoke only once every other weekend so twice a month and every now and then during the week.
    -Thx

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    Thumbs up Re: How long does weed stay in your blood?

    John, the answer is: it depends on your frequency of use and your body weight/body fat ratio. The more frequent, and the more fatty = longer time to purge from your blood.

    Let me give you some insight into my own experience. One of my old coworkers offered me a job a few years back and failed to mention at first that there was a test that I had to pass.

    After I freaked out and told my friend my concern, they let me delay my start date until I was ready. It was a good job working with some of my other friends, so I was highly motivated to NOT fail the test (it would have embarrassed both of us professionally)

    There's a cutoff point, measured in nanograms (ng) that determines whether you PASS or FAIL the test. For MOST tests, this is 50ng, but I've heard that some stricter tests are calibrated to fail at 25ng. If your potential employer is not a total Nazi, they are probably paying as little as possible for your testing, so I'm guessing most places have the 50ng cutoff.

    After not smoking for 15 days and drinking over a gallon of water a day, I spent $80 and went to a place called AnyLabTest and had them do a blood test on me. Before, I was smoking every day, a few times a day, but I'm also a lean, skinny former college athlete. (5'11"/155lbs)

    After 15 days not smoking, my reading was 45ng. This was a little too close for comfort, so I waited longer. I didn't want to spend the $80 again until I was pretty sure I was under the limit.

    After not smoking for 40 days, I had myself retested in the same manner and my reading was 19ng. At this point, I felt pretty safe about my ability to pass.

    I took the employer's test and I had no problems. My rule of thumb now is that I feel "safe" for the 50ng tests after not smoking for about 3-4 weeks, i.e. 21-30 days. But do keep in mind that it's going to be a little different for everybody, depending on metabolism, frequency, etc.

    If you absolutely have to pass the test, it's not a bad idea to go get your own blood test done, if you can spend the cash. Compared to the salary I ended up getting, it wasn't a bad deal. If you know you are going to fail, find any possible reason to delay the testing.

    Good luck.

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    Re: How long does weed stay in your blood?

    If its for drug test reasons only 3 days.

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    420 Member Rin101's Avatar
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    Re: How long does weed stay in your blood?

    Quote Originally Posted by Weed420 View Post
    If its for drug test reasons only 3 days.
    You must be thinking of something else, it stays in your blood much longer than 3 days
    Last edited by Soniq420; 08-07-2009 at 04:14 PM. Reason: other drug reference removed

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    420 Member of the Month HazeSeeker's Avatar
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    Re: How long does weed stay in your blood?

    All that stuff stays in your hair forever ... so ... relax

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    New Member 420-Pirate's Avatar
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    Re: How long does weed stay in your blood?

    haha damn hair
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    Re: How long does weed stay in your blood?

    Quote Originally Posted by Rin101 View Post
    You must be thinking of something else, it stays in your blood much longer than 3 days
    Nope in a blood sample it still only stays for about 3 days. In a urine sample it can last a couple months. In a hair sample it can last a year.

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    Re: How long does weed stay in your blood?

    Well, I personally am a cheater when it comes to drug tests. Hide other peoples urine in a small lotion bottle, drink water alot on the day of the drug test and pee till its all water coming out of you.... yea the last one is tampering is some place but you can justify by saying you enjoy drinking water and follow a healthy lifestyle.

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    420 Member Munki's Avatar
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    Re: How long does weed stay in your blood?

    Quote Originally Posted by Weed420 View Post
    If its for drug test reasons only 3 days.
    This is a good guideline for water soluble drugs. Cannabinoids are primarily fat soluble, so it takes much longer to excrete enough of the metabolites to pass the test. For urine testing on a daily smoker, a good guideline is 30 days. Getting a test done on your own can help you find if you have gotten below the 50ng/ml level.
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