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Test Name

BUN/Creatinine Ratio

CPT Code(s)

82565, 84520

Includes

BUN/Creatinine Ratio (calculated), Urea Nitrogen (BUN), Creatinine, GFR Estimated 

Methodology

See individual tests

Limitations

eGFR is intended for patients with stable renal function.

Reference Range(s)

Bun/Creatinine Ratio 6-22 (calc)  
Urea Nitrogen (BUN)    
Age Male (mg/dL) Female (mg/dL)
<1 Month 4-12 3-17
1-11 Months 2-13 4-14
1-3 Years 3-12 3-14
4-19 Years 7-20 7-20
≥20 Years 7-25 7-25
Creatinine    
Age Male (mg/dL) Female (mg/dL)
≤2 days 0.79-1.58 0.79-1.58
3-27 days 0.35-1.23 0.35-1.23
1 month-9 years 0.20-0.73 0.20-0.73
10-12 years 0.30-0.78 0.30-0.78
13-15 years 0.40-1.05 0.40-1.00
16-17 years 0.60-1.20 0.50-1.00
18-19 years 0.60-1.26 0.50-1.00
20-49 years 0.60-1.35 0.50-1.10
50-59 years 0.70-1.33 0.50-1.05
60-69 years 0.70-1.25 0.50-0.99
70-79 years 0.70-1.18 0.60-0.93
≥80 years 0.70-1.11 0.60-0.88
For patients >49 years of age, the upper reference limit for creatinine is approximately 13% higher for people identified as African-American.
eGFR Non-African American ≥60 mL/min/1.73m2
eGFR African American ≥60 mL/min/1.73m2

Clinical Significance

The BUN/Creatinine ratio is useful in the differential diagnosis of acute or chronic renal disease. Reduced renal perfusion, e.g., congestive heart failure, or recent onset of urinary tract obstruction will result in an increase in BUN/Creatinine ratio. Increased urea formation also results in an increase in the ratio, e.g., gastrointestinal bleeding, trauma, etc. When there is decreased formation of urea as seen in liver disease, there is a decrease in the BUN/Creatinine ratio. In most cases of chronic renal disease the ratio remains relatively normal.

Alternative Name(s)

BUN, Blood Urea Nitrogen

To view specimen requirements and codes please Select a regional laboratory.

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Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

9381A
296X
296
296
296
296
9381A
296
296X
296X
296
30027
296
296
296
296
296
2968
296
296
296
9381A
296X
9381A
296X
296
9050
6105
296
BUN/Creatinine Ratio
296