Urea Nitrogen (BUN)

Test Code

294

CPT Code(s)

84520

Test Code

294

CPT Code(s)

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

Urea Nitrogen (BUN) - Urea is the principle waste product of protein catabolism. BUN is most commonly measured in the diagnosis and treatment of certain renal and metabolic diseases. Increased BUN concentration may result from increased production of urea due to (1) diet or excessive destruction of cellular proteins as occurs in massive infection and fevers, (2) reduced renal perfusion resulting from dehydration or heart failure, (3) nearly all types of kidney disease, and (4) mechanical obstruction to urine excretion such as is caused by stones, tumors, infection, or stricture. Decreased urea levels are less frequent and occur primarily in advanced liver disease and in overhydration.

Test Resources

None found for this test
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Test Details

Methodology

Spectrophotometry (SP)

Reference Range(s)

	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

Alternative Name(s)

Blood Urea Nitrogen,BUN

LOINC® Codes, Performing Laboratory

Service Area must be determined

Methodology

Spectrophotometry (SP)

Reference Range(s)

	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

Alternative Name(s)

Blood Urea Nitrogen,BUN

LOINC® Codes, Performing Laboratory

Service Area must be determined

Preferred Specimen(s)

1 mL serum

Alternative Specimen(s)

Sodium heparin (green-top) tube • Lithium heparin (green-top) tube

Minimum Volume

0.5 mL

Transport Container

Serum separator tube (SST)

Transport Temperature

Room temperature

Specimen Stability

Serum and plasma
Room temperature: 7 days
Refrigerated: 5 days
Frozen: 28 days

Reject Criteria

Anticoagulants other than heparin

Setup Schedule

Service Area must be determined

Preferred Specimen(s)

1 mL serum

Alternative Specimen(s)

Sodium heparin (green-top) tube • Lithium heparin (green-top) tube

Minimum Volume

0.5 mL

Transport Container

Serum separator tube (SST)

Transport Temperature

Room temperature

Specimen Stability

Serum and plasma
Room temperature: 7 days
Refrigerated: 5 days
Frozen: 28 days

Reject Criteria

Anticoagulants other than heparin

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.

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