Vitamin B2

Is it true that vitamin B2 can cause a false positive (I have seen a few sources that claim that it can)? Why is it recommended to take B2 in large amounts for dilution if there is a chance of it causing a false positive? Are false positives a concern if a follow up lab test on the sample (i understand that preliminary positive results are generally followed by lab tests) is included? Also, can the lab detect high amounts of B2 and conclude that the donor was trying to cheat?

Thanks

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Originally Posted by JamesCole770

Is it true that vitamin B2 can cause a false positive (I have seen a few sources that claim that it can)?

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A "false-positive" for THC?

If such claims were actually true, then persons who, in routine, utilize a high Riboflavin breakfast diet would be hit with false-positives.

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Are false positives a concern if a follow up lab test on the sample (i understand that preliminary positive results are generally followed by lab tests) is included?

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False-positives are eliminated when the urine sample undergoes the confirmation GC/MS. The GC/MS would distinguish between illicit and non-illicit substances.

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Also, can the lab detect high amounts of B2 and conclude that the donor was trying to cheat?

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Nope. The labs determine an overly-diluted sample by testing for low levels of creatinine and specific gravity. Riboflavin (B2) is not tested for on a urine sample collected for a drug test. There are no upper/lower level standards established for Riboflavin.