A member asked:

Took 4 etg dip test at 300 cutoff...all negative. 1 hour later took ua...sent to lab came back presumptive positive at 500 cut off how can this be. ho?

A doctor has provided 1 answer

Different methods: The dip test and the laboratory test may use different methods and could give different results. Laboratory tests are generally better standardized.

Answered 8/12/2017

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Thank

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