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what drug is being tested for? how far apart in time were the two tests. you can get these two results if you run the test and get 297ng, rerun exact urine and get 308ng/ml. the result is read by a spectrophotometer so the 2 results are in the same wavelength. different drugs will give different results, so it depends on the drug.

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Q: How accurate are the concentration numbers provided in a semiquantitative non-linear urine drug screen to accurately determine someones recent drug use 297 ng 1st test verses 308 ng ml 2nd test?
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