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| | #1 |
| New Member Join Date: Aug 2008
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| Is it true that when a speciman goes to a lab for testing, there is a preliminary screening. And if that result is negative, then a GC/MS test is not performed? |
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| | #2 | |
| New Member Join Date: Jun 2008
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| Quote:
Lots lab tests have screening tests and then confirmatory tests only on positive specimens. Drug urinary analysis included. | |
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