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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Can Infrequent Smoking Of Tetrahydrocannabinol Appear On Test Done During Pregnancy?

hi iam four months pregnant and I m scared I may test positive for thc on my blood work my next apointment is in four days I don t smoke but maybe once every other day will I be able to test negative if I don t smoke anymore ? And on my first prenatal visit do they usually test for drugs from your blood work?
Thu, 16 Jan 2014
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Psychiatrist 's  Response
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Thanks for using healthcare magic

The elimination half life of cannabis is around 3-20hours. That depend upon the metabolite. Few metabolite are fat soluble and can be detected in urine even after one month. In blood these metabolite are rapidly metabolized. In our case, chances of THC in blood is high due long half life and second a drug need 5 half life u eliminate completely from body that's mean THC need more than 4 days to come out of body.

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Can Infrequent Smoking Of Tetrahydrocannabinol Appear On Test Done During Pregnancy?

Hi Thanks for using healthcare magic The elimination half life of cannabis is around 3-20hours. That depend upon the metabolite. Few metabolite are fat soluble and can be detected in urine even after one month. In blood these metabolite are rapidly metabolized. In our case, chances of THC in blood is high due long half life and second a drug need 5 half life u eliminate completely from body that s mean THC need more than 4 days to come out of body. Thanks