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Specific Lab Tests (Confirmatory, but Delayed) Blood Cyanide Levels: Direct measurement in blood confirms poisoning. Levels > 0.5-1.0 mg/L are toxic; > 2.0 mg/L are often lethal. These results often take too long for immediate treatment decisions. E. Differential Diagnosis Must rule out carbon monoxide poisoning, hydrogen sulfide poisoning, severe sepsis, or other causes of metabolic acidosis.