Final answer:
The gold standard for diagnosis of ethylene glycol toxicity is measurement of the ethylene glycol concentration in the blood using gas chromatography or enzymatic assays.
Step-by-step explanation:
The gold standard for diagnosis of ethylene glycol toxicity is measurement of the ethylene glycol concentration in the blood. This can be done using gas chromatography or enzymatic assays. Gas chromatography is a highly sensitive and specific method that can accurately determine the concentration of ethylene glycol in the blood. Enzymatic assays, such as the alcohol dehydrogenase assay, can also be used to measure ethylene glycol levels, although they may have limitations in terms of sensitivity and specificity.