Bun

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Bun (Medical Term)

Bun (/bʌn/), in medical terminology, refers to Blood Urea Nitrogen, a test that measures the amount of urea nitrogen in the blood.

Etymology

The term "Bun" is an acronym derived from Blood Urea Nitrogen. Urea nitrogen is a waste product that's created in the liver when the body breaks down proteins. It's then transported in the blood (hence the term "blood urea nitrogen" or BUN) to the kidneys, which filter out the urea nitrogen and remove it from the body through urine.

Related Terms

  • Urea: A nitrogenous compound that is the end product of protein metabolism. Urea is found in the blood and urine. Too much urea in the blood is a sign that the kidneys may not be functioning properly.
  • Nitrogen: A chemical element (symbol N) that is a constituent of proteins and nucleic acids and is essential for life.
  • Kidneys: A pair of organs in the human body that filter waste products out of the blood and produce urine.
  • Protein Metabolism: The process by which proteins are synthesized, broken down, and converted into other forms in the body.
  • Liver: A large organ in the body that produces many important substances, including bile and blood proteins, and breaks down substances, including proteins and toxins.

See Also

  • Creatinine: Another waste product that's measured to evaluate kidney function.
  • Renal Function: The kidneys' ability to filter waste products from the blood.
  • Uremia: A condition characterized by high levels of urea and other nitrogenous waste products in the blood.

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