When initial evaluation suggests secondary causes of pediatric hypertension, which additional measurement may be indicated?

When initial evaluation suggests secondary causes of pediatric hypertension, which additional measurement may be indicated?

• A. Plasma renin and catecholamine levels
• B. Serum bicarbonate
• C. Serum calcium
• D. Thyroid-stimulating hormone

Answer: (B)

When you suspect a secondary cause of hypertension in a child, look for renal-related metabolic problems that could be driving the high blood pressure. A practical next measurement is serum bicarbonate because it screens for metabolic acidosis, which often accompanies renal disease or renal tubular disorders. Detecting a low bicarbonate supports a renal/metabolic source of hypertension and guides further workup (such as urinalysis for protein, kidney function tests, and imaging). If bicarbonate is normal, it doesn’t rule out all secondary causes, but it helps prioritize evaluation toward renal and metabolic etiologies. Other measurements, like plasma renin and catecholamines or thyroid and calcium tests, target more specific endocrine conditions and aren’t as broadly informative in the initial assessment focused on renal contributors.

When you suspect a secondary cause of hypertension in a child, look for renal-related metabolic problems that could be driving the high blood pressure. A practical next measurement is serum bicarbonate because it screens for metabolic acidosis, which often accompanies renal disease or renal tubular disorders. Detecting a low bicarbonate supports a renal/metabolic source of hypertension and guides further workup (such as urinalysis for protein, kidney function tests, and imaging). If bicarbonate is normal, it doesn’t rule out all secondary causes, but it helps prioritize evaluation toward renal and metabolic etiologies. Other measurements, like plasma renin and catecholamines or thyroid and calcium tests, target more specific endocrine conditions and aren’t as broadly informative in the initial assessment focused on renal contributors.