An example of a confirmatory laboratory test used to verify a borderline abnormal newborn screening test result in an asymptomatic individual would be gas chromatography combined with mass spectrometry,particularly for organic acid analysis.

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Gas chromatography combined with mass spectrometry is a commonly used confirmatory test for organic acid analysis in newborn screening. It is used to verify borderline abnormal results in asymptomatic individuals.

An Example of a Confirmatory Laboratory Test Used to Verify