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Doctor insights on: How Long Does Marijuana Stay In Your Blood

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Dr. Ed Friedlander
Board Certified, Pathology
38 years in practice
136M people helped
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How long does marijuana stay in your blood?

How long does marijuana stay in your blood?

Up to weeks: The stuff also enters fat cells and may stay detectable for a long time especially if you're burning fat. One of the ironies of mandatory drug testing is that drug-users know marijuana stays detectable longer than the far more dangerous illegal drugs, so on friday night people decide to use intoxicants that are far more likely to do harm. Why not be "high on life" for now? ...Read more

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Dr. Keegan Duchicela
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8 years in practice
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Marijuana (Definition)

Marijuana refers to the various preparations of the Cannabis plant into the psychoactive drug for recreational use ...Read more


Dr. Byron Law-Yone
Board Certified, Psychiatry
49 years in practice
800K people helped
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How long does marijuana stay in your blood stream?

How long does marijuana stay in your blood stream?

A few hours: It is broken down into other products within a few hours. These can be stored in fat and then released into the body and urine for weeks or longer depending on how much and how often you use. ...Read more

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Dr. Keegan Duchicela
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8 years in practice
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Dr. Kevin Passer
Board Certified, Child Psychiatry
29 years in practice
5M people helped
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How long does marijuana stay in the blood stream?

How long does marijuana stay in the blood stream?

One Month: For a heavy user up to one month, rarely longer. Thc really doesn't stay in the blood stream, rather-it is stored in fat and is considered fat soluble. In fact, that is why it can take so long to get out of the body. The thc has to get out of the fat cells. It does depend upon, as one colleague has noted, the frequency of the use as well as the potency of the drug. ...Read more

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Dr. Gurmukh Singh
Board Certified, Pathology
43 years in practice
95M people helped
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How long does marijuana stay in a baby's cord blood ? I have a friend who is pregnant and did not find out until 5 months and was smoking at the time

How long does marijuana stay in a baby's cord blood ? I have a friend who is pregnant and did not find out until 5 months and was smoking at the time

Unclear question: If your question is, "if you friend quits smoking weed now, will the cord blood show marijuana?" then the answer is no. Marijuana can be detectable in the urine of a chronic user for a few weeks after the last exposure. ...Read more

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Dr. Keegan Duchicela
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8 years in practice
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Dr. Pamela Pappas
Board Certified, Psychiatry
36 years in practice
135M people helped
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How long does marijuana stay in a babies system that is still in the womb in the poop pee and blood?

How long does marijuana stay in a babies system that is still in the womb in the poop pee and blood?

Hard to know: Research on babies born after the mother smoked marijuana in pregnancy shows mixed results. Some of jamaican women even show no negative results. http://tinyurl.com/n85vrj3 nonetheless, thc remains in the baby at least as long as it remains in the mother -- depending on frequency of use, this could be months of positive urines since lase use. Thc is stored in placenta and other fat. ...Read more

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Dr. Keshab Paudel
Board Certified, Internal Medicine
13 years in practice
1M people helped
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How long does it take marijuana to get out of system for blood test?

It depends: How long marijuana is detected in the urine depends strongly on frequency of use. In regular users (more than once a week), the marijuana metabolite builds up to a high level, often on the order of hundreds of nanograms per milliliter (ng/ml), from which it may take weeks to decline back below the threshold of detection. The situation is different for occasional users (no more than once a week). ...Read more

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Dr. Heidi Fowler
Board Certified, Psychiatry
19 years in practice
527M people helped
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Docs, usually how long is marijuana in your blood stream?

THC: Single use marijuana can be detected 12 to 24 hours in blood. Regular use marijuana can be detected for 2 to 7 days in blood. ...Read more

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Dr. Alan Wartenberg
Board Certified, Addiction Medicine
43 years in practice
6M people helped
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I have to get blood taken for my physical and I am a frequent smoker of both tabacco and marijuana, will this effect the results i smoked about an hour ago

I have to get blood taken for my physical and I am a frequent smoker of both tabacco and marijuana, will this effect the results i smoked about an hour ago

Depends: Drugs are rarely looked for in blood tests - the preferred testing is of urine. Doctors usually do not do drug testing for a routine physical, and if they were, they would get urine either instead of or in addition to blood. It is never the wrong time to quit smoking, especially of tobacco, and you need to consider whether the marijuana is a problem as well. Talk to your doctor. ...Read more

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Dr. Randy Baker
Board Certified, Holistic Medicine
34 years in practice
21M people helped
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If someone smoked marijuana 2 weeks ago would they be able to pass a blood test?

If someone smoked marijuana 2 weeks ago would they be able to pass a blood test?

Probably, however...: As my colleague dr. Pappas mentions, marijuana is almost always tested in urine rather than blood, so someone would almost certainly pass a blood test but is more likely to face a urine test. If one does not smoke it regularly and only used a bit 2 weeks ago they would probably pass a urine test, but if they are a regular smoker who only stopped 2 weeks ago they might not pass it. ...Read more

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Dr. Ed Friedlander
Board Certified, Pathology
38 years in practice
136M people helped
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When you donate blood- can they identify marijuana in it?

When you donate blood- can they identify marijuana in it?

We won't look: Even if you believe our marijuana laws are wise, nobody cares whether there is a little bit of the stuff in blood for transfusion. It is hard enough to get people to donate blood at all without their having to be busted for weed as a result. Thanks for your being willing to donate blood, and don't worry about our "war on drugs" in the privacy of a blood donation. ...Read more

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Ganja (Definition)

Ganja is also known as Marijuana. Ganja is a Sanskrit word ...Read more


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Dr. Keegan Duchicela
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