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Urea is a waste product formed in the liver from the breakdown of proteins and amino acids. It is a key component of urine and is primarily excreted by the kidneys. The measurement of urea levels in the blood (often referred to as blood urea nitrogen or BUN) is commonly used to assess kidney function and overall metabolic health. Elevated urea levels can indicate impaired kidney function, dehydration, or excessive protein intake, while low levels may suggest liver disease or malnutrition. Monitoring urea levels is important for diagnosing and managing various medical conditions, particularly those related to kidney health.