BUN/Creatinine Ratio

Test Code

296

CPT Code(s)

82565, 84520

Test Code

296

CPT Code(s)

82565, 84520

Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano | Quest Nichols Institute -San Juan Capistrano, CA. Please provide SERVICE AREA INFORMATION to confirm Test Code for the lab that services your account or to find available tests you can order.

In-home collection may be available in your area for purchase through Quest Mobile.

Clinical Significance

BUN/Creatinine Ratio - 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.

Test Resources

Test Details

Includes

Urea Nitrogen (BUN), Creatinine, eGFR, BUN/Creatinine Ratio (calculated)

Methodology

See individual tests

Reference Range(s)

⁠⁠⁠⁠⁠⁠⁠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
18-29 years	0.60-1.24	0.50-0.96
30-39 years	0.60-1.26	0.50-0.97
40-49 years	0.60-1.29	0.50-0.99
50-59 years	0.70-1.30	0.50-1.03
60-69 years	0.70-1.35	0.50-1.05
70-79 years	0.70-1.28	0.60-1.00
≥80 years	0.70-1.22	0.60-0.95

For patients >49 years of age, the upper reference limit for creatinine is approximately 13% higher for people identified as African-American.

eGFR

≥60 mL/min/1.73m²

Bun/Creatinine Ratio

<1 year	Not Established
1-5 years	16-50	calc
6-10 years	13-36	calc
11-16 years	9-25	calc
≥17 years	6-22	calc

Alternative Name(s)

Blood Urea Nitrogen,BUN

LOINC® Codes, Performing Laboratory

Service Area must be determined

Includes

Urea Nitrogen (BUN), Creatinine, eGFR, BUN/Creatinine Ratio (calculated)

Methodology

See individual tests

Reference Range(s)

⁠⁠⁠⁠⁠⁠⁠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
18-29 years	0.60-1.24	0.50-0.96
30-39 years	0.60-1.26	0.50-0.97
40-49 years	0.60-1.29	0.50-0.99
50-59 years	0.70-1.30	0.50-1.03
60-69 years	0.70-1.35	0.50-1.05
70-79 years	0.70-1.28	0.60-1.00
≥80 years	0.70-1.22	0.60-0.95

For patients >49 years of age, the upper reference limit for creatinine is approximately 13% higher for people identified as African-American.

eGFR

≥60 mL/min/1.73m²

Bun/Creatinine Ratio

<1 year	Not Established
1-5 years	16-50	calc
6-10 years	13-36	calc
11-16 years	9-25	calc
≥17 years	6-22	calc

Alternative Name(s)

Blood Urea Nitrogen,BUN

LOINC® Codes, Performing Laboratory

Service Area must be determined

Preferred Specimen(s)

2 mL serum

Alternative Specimen(s)

Spun SST tube

Minimum Volume

1 mL

Transport Container

Serum separator tube (SST)

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 5 days
Frozen: 28 days

Reject Criteria

Plasma

Setup Schedule

Service Area must be determined

Preferred Specimen(s)

2 mL serum

Alternative Specimen(s)

Spun SST tube

Minimum Volume

1 mL

Transport Container

Serum separator tube (SST)

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 5 days
Frozen: 28 days

Reject Criteria

Plasma

Setup Schedule

Service Area must be determined

In-home collection may be available in your area for purchase through Quest Mobile.

Test Details

Clinical Significance

Test Resources

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 guidance 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.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

The tests listed by specialty and category are a select group of tests offered. For a complete list of Quest Diagnostics tests, please adjust the filter options chosen, or refer to our Directory of Services.

BUN/Creatinine Ratio

Test Code

Clinical Significance

Test Resources

Test FAQ

Test Guide

Test Summary

Test Details

Includes

Methodology

Reference Range(s)

Alternative Name(s)

LOINC® Codes, Performing Laboratory

Methodology

Reference Range(s)

Alternative Name(s)

Preferred Specimen(s)

Alternative Specimen(s)

Minimum Volume

Transport Container

Transport Temperature

Specimen Stability

Reject Criteria

Setup Schedule

Clinical Significance

Test Resources