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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Long Does Marijuana Remain In The System?

Hi i am 15 weeks pregnate.. i have been smoking weed for 15 years now.. i have been smoking since i found out but have slowed down alot.. its been hard with the migranes i get everyday and the morning sickness. My last check up the dr did tell me i tested postive and need to stop. I havent smoked in about a week now but im scared when i go for my next visit i will test positive again. How long does it take for my system to clear?
Tue, 26 May 2015
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General & Family Physician,  's  Response
THC concentrations in the blood of occasional marijuana users quickly fall below limits of drug testing within 8 to 12 hours of use. However, most drug tests for marijuana compounds are made through urinalysis. And urinalysis for THC is highly precise, and measured in nanograms (n-9), or one billionth of a gram. So in this way, THC can be detected in urine several weeks or months after initial administration with precision. Positive urine based marijuana test results generally indicate use within 1-3 days; however, the detection window could be significantly longer following heavy, chronic, use. So in general, the amount of time marijuana/THC can be detected depends on quantity, potency, duration and frequency of ingestion, and the method used to detect THC or its metabolites.
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How Long Does Marijuana Remain In The System?

THC concentrations in the blood of occasional marijuana users quickly fall below limits of drug testing within 8 to 12 hours of use. However, most drug tests for marijuana compounds are made through urinalysis. And urinalysis for THC is highly precise, and measured in nanograms (n-9), or one billionth of a gram. So in this way, THC can be detected in urine several weeks or months after initial administration with precision. Positive urine based marijuana test results generally indicate use within 1-3 days; however, the detection window could be significantly longer following heavy, chronic, use. So in general, the amount of time marijuana/THC can be detected depends on quantity, potency, duration and frequency of ingestion, and the method used to detect THC or its metabolites.