The best diagnostic test for anaphylaxis in a child exposed to an allergen 3 hours before arrival to hospital is

Correct Answer: D

Rationale: Plasma tryptase levels peak within 3 hours and are the most reliable diagnostic test for anaphylaxis.

Correct Answer: C

Rationale: Septic shock leads to distributive shock due to widespread vasodilation and capillary leakage.

Correct Answer: C

Rationale: Childhood SLE typically presents after 5 years of age.

Correct Answer: D

Rationale: Thelarche typically occurs between ages 8-13, marking the start of female puberty.

Correct Answer: C

Rationale: Brain damage from drowning typically begins after 4-6 minutes of submersion, with significant damage occurring by 30 minutes due to anoxic injury and cerebral hypoxia.