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STR Data Analysis and Interpretation for Forensic Analysts

Known Extraction Control(s)

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Many laboratories include known extraction controls in the analysis process. These controls aid in determining the overall performance of the entire process from extraction through typing.

The known extraction control should show the expected alleles. If no peaks are seen, this may indicate a problem with the extraction, amplification or injection. In the event that the known extraction control does not yield the correct results, analysts should troubleshoot the problem and follow the procedures established by the laboratory.


It is expected that injection issues would have been identified in the internal size standard evaluation step.

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