Home Forums Drug Testing Does labcorp always do confirmation(gc/ms) test?

3 replies, 3 voices Last updated by Blue Dream October 4, 2018 at 6:54 pm
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    Blue Dream

    Last smoked 15 days ago – Before that I had smoked 2x in a month.

    I have passed 5 @ home 50NG THC tests. I tried a 20NG test and I got a faint line – end of day voids.

    My Question: Does Labocorp Always do GC/MS Confirmation? I’ve called multiple LabCorps, and they’re all giving me different answers: “If the employer requests” “Only on positive Screening” “We always confirm with GC/MS”

    I’m pushing this test off a few more days, and I’ll take the last 20NG test I have. I’ve also got Synth. for backup, but wanted to test clean on my own!

    Thanks for your help!


    Mega Man

    It won’t be lab Corp that decides, it will be what the employer has paid them to do. Many employers follow the samhsa guidelines which is confirmation of all positive screens (required to meet evidentiary requirements) and a random sample of negative screens (to root out false negatives).



    It’s up to the employer if they want to GC/MS the sample. Otherwise, it will not be GC/MS unless it tests positive at the 50 ng/mL level. Then it would be used as a confirmation test.

    Use the Drug Test Calculator and resources if you have the time.


    Blue Dream

    UPDATE: I used XStream Synthetic Urine. – So far so good. The only thing I could see was the temp range OKAY

    The test my employer ordered was 10-5TP-200

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