Which of the following is NOT among substances typically checked in known overdoses?

• A. Methanol
• B. Ethanol
• C. Salicylate
• D. Acetaminophen

Answer: (A)

In overdoses, testing focuses on substances that are commonly encountered and have clear, specific treatments. Acetaminophen levels are checked because a simple antidote, N-acetylcysteine, can prevent severe liver injury if given in time. Salicylate levels are checked due to potential toxicity that can cause metabolic acidosis and other serious effects, with management ranging from bicarbonate therapy to dialysis in severe cases. Ethanol levels are also commonly measured to assess intoxication and to identify possible co-ingestion that could alter treatment.

Methanol testing, while important if methanol exposure is suspected, is not part of routine overdose panels and is ordered only when there is specific suspicion, since it requires specialized assays and is less common. That’s why methanol is the best choice for the item asking which is NOT typically checked.