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Does Saliva Test Detect Recent Intake Of Weed?

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Posted on Mon, 23 Feb 2015
Question: I took 1 hit of weed last night about 11pm and did a salvia test and 4pm the next day mind you I don't ever smoke pot.. im 5"9 165 pounds

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Answered by Dr. Chintan Solanki (2 hours later)
Brief Answer:
Your test may come positive if done in lab

Detailed Answer:
Hello Thanks for writing to us,

I think you are asking that your test will come positive or not.
Saliva test can detect only recent intake. It can not describe that person has taken weed regular or not in past

If saliva sample is tested in a lab, the detection level can be as low as 0.5 ng/mL which can detectable up to 72 hours after intake). In that case your test may come positive.

And if an onsite instant saliva drug test is used, the cut off level is generally 50 ng/mL and that is detectable up to 12 hours after intake.In that case your test would be negative as already 17 hours has been passed of last intake.

Hope this answers your query, I will be happy to help further if needed.

Regards,
Dr.Chintan Solanki.
Note: For further guidance on mental health, Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Chintan Solanki

Psychiatrist

Practicing since :2007

Answered : 2406 Questions

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Does Saliva Test Detect Recent Intake Of Weed?

Brief Answer: Your test may come positive if done in lab Detailed Answer: Hello Thanks for writing to us, I think you are asking that your test will come positive or not. Saliva test can detect only recent intake. It can not describe that person has taken weed regular or not in past If saliva sample is tested in a lab, the detection level can be as low as 0.5 ng/mL which can detectable up to 72 hours after intake). In that case your test may come positive. And if an onsite instant saliva drug test is used, the cut off level is generally 50 ng/mL and that is detectable up to 12 hours after intake.In that case your test would be negative as already 17 hours has been passed of last intake. Hope this answers your query, I will be happy to help further if needed. Regards, Dr.Chintan Solanki.