Following a positive immunoassay screen for barbiturates, mass spectrometry testing definitively identifies the specific barbiturate present. This is essential because immunoassays may show positives from cross-reactive substances, and treatment decisions or legal consequences require accurate identification of which barbiturate is present.
This test is used in addiction medicine, pain management, workplace and forensic testing, and clinical settings where specific identification matters. Sample type is urine, often under chain-of-custody protocols.
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