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Blood Urea Nitrogen (BUN) Ratio Calculator

Calculate blood urea nitrogen BUN ratio from BUN level, creatinine level, BUN/creatinine ratio, and age.

Blood Urea Nitrogen (BUN) Ratio Calculator

Calculate blood urea nitrogen BUN ratio from BUN level, creatinine level, BUN/creatinine ratio, and age.

Input your BUN data

Formula

BUN/creatinine ratio = BUN level (mg/dL) / creatinine level (mg/dL).

If ratio not provided: Calculated from BUN and creatinine levels from blood tests.

Normal ranges: BUN: 7-20 mg/dL, Creatinine: 0.6-1.2 mg/dL (men), 0.5-1.1 mg/dL (women). Normal BUN/creatinine ratio is typically 10-20:1.

BUN/creatinine ratio helps distinguish between prerenal and renal causes of elevated BUN. Elevated ratios may indicate dehydration or prerenal azotemia.

Steps

  • Enter BUN (blood urea nitrogen) level (mg/dL) from blood test.
  • Enter creatinine level (mg/dL) from blood test.
  • Optionally enter BUN/creatinine ratio if calculated.
  • Enter your age (BUN ranges can vary by age).
  • Review BUN/creatinine ratio, kidney function status, and recommendations.

Additional calculations

Enter your BUN data to see additional insights.

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Complete guide snapshot

BUN (blood urea nitrogen) is a waste product from protein metabolism filtered by the kidneys. The BUN/creatinine ratio helps distinguish between prerenal and renal causes of elevated BUN. Normal BUN: 7-20 mg/dL, normal ratio: 10-20:1.

Use this calculator to assess BUN/creatinine ratio from BUN level, creatinine level, BUN/creatinine ratio (optional), and age.

FAQs

What is BUN?

BUN (blood urea nitrogen) is a waste product from protein metabolism that is filtered by the kidneys. Elevated BUN may indicate kidney dysfunction, dehydration, or high protein intake.

What are normal BUN levels?

Normal BUN ranges from 7-20 mg/dL for adults. Values outside this range may indicate kidney dysfunction, dehydration, high protein intake, or other conditions.

What is the BUN/creatinine ratio?

The BUN/creatinine ratio helps distinguish between different causes of elevated BUN. Normal ratio is typically 10-20:1. Higher ratios may indicate dehydration or prerenal causes.

What causes elevated BUN?

Elevated BUN can result from kidney dysfunction, dehydration, high protein intake, gastrointestinal bleeding, heart failure, or medications affecting kidney function.

What causes low BUN?

Low BUN can result from low protein intake, liver disease, malnutrition, overhydration, or pregnancy. It is less common than elevated BUN.

What does a high BUN/creatinine ratio mean?

A ratio greater than 20:1 may suggest dehydration, prerenal azotemia, gastrointestinal bleeding, or high protein intake. It helps distinguish prerenal from renal causes.

What does a low BUN/creatinine ratio mean?

A ratio less than 10:1 may suggest low protein intake, liver disease, malnutrition, or overhydration. It is less common and may indicate different underlying conditions.

Does age affect BUN?

BUN levels can vary slightly with age. Older adults may have slightly different normal ranges. Age-specific reference ranges are important for accurate interpretation.

Can I track BUN at home?

Home BUN tests are limited. Blood tests through healthcare providers provide accurate BUN measurements. Regular monitoring is important for kidney health.

When should I consult a healthcare provider?

Consult a healthcare provider if BUN is elevated, if BUN/creatinine ratio is abnormal, if you have symptoms (fatigue, swelling, changes in urination), or if you have risk factors for kidney disease.

Summary

This tool calculates blood urea nitrogen BUN ratio from BUN level, creatinine level, BUN/creatinine ratio (optional), and age.

Outputs include BUN level, creatinine level, BUN/creatinine ratio, ratio score, status, recommendations, an action plan, and supporting metrics.

Formula, steps, guide content, related tools, and FAQs ensure humans or AI assistants can interpret the methodology instantly.

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Blood Urea Nitrogen (BUN) Ratio Calculator

Calculate blood urea nitrogen BUN ratio from BUN level, creatinine level, BUN/creatinine ratio, and age.

How to use Blood Urea Nitrogen (BUN) Ratio Calculator

Step-by-step guide to using the Blood Urea Nitrogen (BUN) Ratio Calculator:

  1. Enter your values. Input the required values in the calculator form
  2. Calculate. The calculator will automatically compute and display your results
  3. Review results. Review the calculated results and any additional information provided

Frequently asked questions

How do I use the Blood Urea Nitrogen (BUN) Ratio Calculator?

Simply enter your values in the input fields and the calculator will automatically compute the results. The Blood Urea Nitrogen (BUN) Ratio Calculator is designed to be user-friendly and provide instant calculations.

Is the Blood Urea Nitrogen (BUN) Ratio Calculator free to use?

Yes, the Blood Urea Nitrogen (BUN) Ratio Calculator is completely free to use. No registration or payment is required.

Can I use this calculator on mobile devices?

Yes, the Blood Urea Nitrogen (BUN) Ratio Calculator is fully responsive and works perfectly on mobile phones, tablets, and desktop computers.

Are the results from Blood Urea Nitrogen (BUN) Ratio Calculator accurate?

Yes, our calculators use standard formulas and are regularly tested for accuracy. However, results should be used for informational purposes and not as a substitute for professional advice.