Cut Off Levels For Screening & Confirmation Testing (Drug Test Levels)

Cut off levels are used to determine whether to immediately report a negative drug test result after an initial screening or to send the specimen on to the laboratory for further confirmation testing.

A higher cut off level in the screening process, may cast a wider net to find the drug class being tested. The confirmation test is then used as the definitive testing process to determine a positive result.

A screening result commonly indicates that a class of drugs is positive, not necessarily which specific drug triggered the positive result. Confirmation testing is necessary because a false positive can occur when the screening phase is positive but the drug is not actually present. A false negative can occur when the drug is actually present but the screening result is negative.

In order to determine if a urine specimen is negative or positive for drugs of abuse, all specimens go through a screening procedure, and then if initial results are above the screening cut off levels, that specimen is then flagged for confirmation testing.

The second round of testing, called confirmation testing, uses gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS).

The subsequent confirmatory procedures are performed on a second independent portion of the original urine specimen. Specimens that test above the confirmation cut off levels are reported by the lab as positive.





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[PembeGangGlory]

If the initial cutoff test is positive and the confirmation is negative, l wish to know if that means the person has been on drug or not

[shanemichaelneal]

I took a drug test today, on the paperwork it said 9 panel test, im not sure if its sent off to a lab, but will it be able to tell a difference between Klonopin vs Xanax? Or will they both pop up as Benzos

[Musicaltherapylab]

Hey, I took a drug test recently, I smoked like 5 days prior maybe half a blunt. I took some burdock root the night before and my urine was yellow. I’m not a heavy user. Mano grams for the test is 50. The doctor used a 10 panel cup to show me if there thc in my system and he said yes. Do you think I will still pass ? And is 50 nanograms high or low ?