Final answer:
In the case of a three-year-old with suspected poisoning but stable vital signs, the next best step is to administer activated charcoal. Gastric lavage is generally reserved for life-threatening ingestions within one hour of the event and not typically indicated in this case.
Step-by-step explanation:
In the scenario presented, a three-year-old boy with suspected poisoning from furniture polish requires immediate medical attention. The primary concern is the potential toxicity, and the initial steps in management should focus on stabilizing the patient and preventing further absorption of the poison. Since the boy has normal vital signs and is active, it indicates that he is currently stable.
The next best step in management, as per the clinical guidelines, would be to give activated charcoal, which can effectively adsorb and prevent the absorption of many poisons from the gastrointestinal tract if administered promptly and within a few hours of the poisoning incident. Gastric lavage is generally not recommended unless the patient presents within an hour of poisoning with a life-threatening ingestion that is not adsorbed by charcoal. In any suspected poisoning case, it is also crucial to consult with a poison control center for specific recommendations based on the substance ingested.