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Hi please clarify your question.
If they got a different answer with confirmatory testing, then they would send a follow up report...sometimes even if it is the same answer....
Not sure what you are asking here
Please attach the report here
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Every lab uses their own internal method for using specimen ID numbers, but the most likely reason why the one report has a -1 is an internal method for keeping track of multiple tests being done on the same sample, so that a second test done by the same lab would be labeled with a -2. Ultimately, though, if you want to know the lab procedure for specimen ID numbers, you would need to contact the lab.
A transcription error is not a fatal flaw, although it may raise questions, particularly if there is not a ready explanation for the error. When we look at these quantitative confirmatory tests, they are considered the gold standard for detection of drugs, but a potential area for error is if there is mishandling of the specimen, either en route to the lab or within the lab, and mislabeling is one of the possible errors that can happen with mishandling of the specimen. Most collection centers and labs have implemented duplicated procedures to assure that the specimens have been handled correctly, but if there is one documented labeling error, it does raise a question of whether there was a more significant handling error.
If I can provide any additional information, please let me know.
It cannot be determined from these reports which split sample was tested by the lab.