Blood Urea Nitrogen (BUN)

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What is the Lab Name for Blood Urea Nitrogen?

Blood Urea Nitrogen

What is the Lab Abbreviation for Blood Urea Nitrogen?

BUN

What is Blood Urea Nitrogen in terms of Nursing Labs?

Blood urea nitrogen (BUN) measures the amount of urea in the blood. When protein is broken down ammonia is formed.  Ammonia is converted to urea in the liver and is eventually excreted in the kidneys.

What is the Normal Range for Blood Urea Nitrogen?

7-20 mg/dL

What are the Indications for Blood Urea Nitrogen?

  • Identifying:
    • Liver Problems
    • Renal Problems
    • Hydration Status
    • Tumor Lysis
  • Evaluate effects of drugs on:
    • Liver
    • Kidney
  • Monitor effectiveness of hemodialysis

What would cause Increased Levels of Blood Urea Nitrogen?

  • Renal Failure
  • Congestive Heart Failure (CHF)
  • Myocardial Infarction (MI)
  • Kidney Disease
  • Shock
  • Dehydration
  • Excessive Protein Intake
  • Diabetes Mellitus (DM)
  • Gastrointestinal (GI) bleed
  • Urinary Tract Obstruction

What would cause Decreased Levels of Blood Urea Nitrogen?

  • Liver Failure
  • Over-hydration
  • Inadequate Protein Intake
  • Pregnancy

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