Understanding Blood Urea Nitrogen (BUN)

Blood Urea Nitrogen (BUN) is a key biomarker in blood tests that measures kidney function by assessing urea nitrogen levels in the blood.

What is Blood Urea Nitrogen?

Measures kidney function by assessing urea nitrogen levels in the blood.

Normal Range

Low < 6 mg/dL
Normal 6 - 20 mg/dL
High > 20 mg/dL

The normal Blood Urea Nitrogen range is between 6.0 and 20.0 mg/dL.

High Blood Urea Nitrogen Levels (Above 20.0 mg/dL)

Causes of High Blood Urea Nitrogen

High BUN can indicate kidney dysfunction, dehydration, excessive protein intake, or heart failure. Improving hydration, moderating protein intake, and managing kidney function are essential for reducing BUN levels.

Health Effects of High Blood Urea Nitrogen

High BUN can contribute to kidney stress and waste buildup in the bloodstream, leading to nausea, fatigue, and worsening kidney disease.

Low Blood Urea Nitrogen Levels (Below 6.0 mg/dL)

Causes of Low Blood Urea Nitrogen

Low BUN may result from malnutrition, liver disease, overhydration, or anabolic steroid use. Increasing dietary protein, maintaining proper hydration, and addressing liver health can help normalize levels.

Health Effects of Low Blood Urea Nitrogen

Low BUN may lead to muscle wasting and protein metabolism imbalances, particularly in cases of malnutrition or liver dysfunction.

Treatment and Management

For High Blood Urea Nitrogen

  • Medical evaluation to determine the underlying cause
  • Lifestyle modifications as recommended by your healthcare provider
  • Regular monitoring of Blood Urea Nitrogen levels
  • Follow-up testing as needed

For Low Blood Urea Nitrogen

  • Medical evaluation to identify the root cause
  • Appropriate supplementation if recommended
  • Dietary changes as advised
  • Regular monitoring and follow-up

When to See a Doctor

Consult your healthcare provider if:

  • Your Blood Urea Nitrogen levels are consistently outside the normal range
  • You experience symptoms associated with abnormal Blood Urea Nitrogen levels
  • You have risk factors for conditions affecting Blood Urea Nitrogen levels
  • You’re taking medications that may affect Blood Urea Nitrogen levels

Prevention

  • Regular health check-ups
  • Balanced diet
  • Regular exercise
  • Stress management
  • Adequate sleep
  • Avoiding known triggers

Additional Information

For more detailed information about managing your Blood Urea Nitrogen levels, consult with your healthcare provider or visit reputable medical websites.