A 24-month-old child who is referred by health institute after parental concern of lonely play and delayed speech he is pica eater. Diagnosed as autistic spectrum disorder (ASD). Of the following, the MOST important next action is

Correct Answer: C

Rationale: Lead poisoning can mimic developmental delays, so checking lead levels is crucial.

Correct Answer: D

Rationale: Shellfish allergy is often lifelong, unlike milk or egg allergies, which many children outgrow.

Correct Answer: D

Rationale: The acellular pertussis vaccine is recommended by the American Academy of Pediatrics beginning at age 6 weeks. Infants are at greater risk for complications of pertussis.

Correct Answer: C

Rationale: IV calcium gluconate stabilizes cardiac membranes, reducing the risk of arrhythmias from hyperkalemia, without lowering potassium levels.

Correct Answer: C

Rationale: Salicylate poisoning leads to metabolic acidosis with a high anion gap due to the accumulation of organic acids, including lactate and ketoacids. It initially causes respiratory alkalosis, followed by metabolic acidosis.