Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.

Definition of Blood urea nitrogen

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

Blood urea nitrogen: A measure of the urea level in blood. Abbreviated BUN. Diseases that compromise the function of the kidney frequently lead to increased BUN levels.

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