how long does marijuana stay in your blood for

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Dr. Ed Friedlander answered:

How long does marijuana stay in your blood?

Up to weeks

Cannabis
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?
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Dr. Byron Law-Yone answered:

How long does marijuana stay in your blood stream?

A few hours

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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.
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Dr. James Burns answered:

Is it okay to smoke marihuana while being on a blood thinner?

Not a good idea

Blood
While there is no direct interaction between the active ingredient THC and what I assume you refer to as warfarin (blood thinner) the risk of injury and unintended bleeding increases with any substance that affects judgement, coordination, and balance which will happen with marijuana. So, No, I don't think it is OK, but that's just me.
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If I PASSIVELY smoked marihuana ca. 1 day before blood donation, could it be harmful for a patient who receives my blood?

Blood drive rules

Blood_donation
Restrictions regarding blood donations are in place for safety and many patients who use prescription drugs cannot donate. Recreational drugs actively present in body are an additional prohibition. Do not really know what you mean by passive smoking, unless you refer to someone else nearby and you merely encountered the fumes. Doubtful anyone would suffer from this.
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My friend is having a blood test. It checks for CBC, tsh and ft4. Will marihuana and alcohol show up in these test results?

NO

Cbc
The test you mention would not show drug or alcohol levels.
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Dr. Catherine Shaw answered:

Hi, friend is getting a blood test soon (fbe, tsh, b12/folate and iron studies) Him being a regular cannabis consumer, will the test detect marijuana?

Unlikely

Cannabis
THC metabolites are stored in body fats and excreted through urine. So it is unlikely that THC would be detected in blood test. But cannabis use would be detected in urine test. If he should be testers for employment etc., best he stop or reduce cannabis. Best regards, Dr. Catherine Shaw
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How to get cannabis out of your blood quickly?

Can't be done

Blood
To the best of my knowledge, there is no quick way to clear THC, the active drug in cannabis. This is a fat-soluble drug, which means it collects in body fat (and in the brain, which contains a lot of fatty compounds), and is released slowly into the bloodstream over time. Cannabis can be detected 3-4 weeks after the last use by the usual drug-screening tests, longer with hair sampling.
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Will topical cannabis show up on a blood test?

THC

Cannabis
THC metabolites may be tested for on a screening for illicit drugs.
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Dr. Michael Engel answered:

Can cannabis show up in a sickle cell blood test?

The test for sickle

Marijuana
cell hemoglobin is an electrophoretic technique, or alternatively, a test based upon differential solubility/ppt. Drug screens use a completely different technology. The tests must be done separately, and have no effect, one on the other. If you're asking because you have sickle cell disease and have been smoking marijuana, I'd advise you stop the latter and follow your Dr.'s advice for the former
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Can consuming cannabis oil lower your white blood cell count?

Good Question

Cannabis
Although I am not aware of a specific study on cannabis oil and WBC, there was a study showing that hemp seed which contains THC as its active component has long term toxicological implication such as bone marrow suppression with respect to the concentration given on the erythrocytes of mammals. It is recommended that individuals who have anemia or immunosuppression not use THC on a regular basis.
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