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Biomarkers · Chemical

BUN

A BUN, or blood urea nitrogen test, measures the amount of urea nitrogen in your blood. Urea nitrogen is a waste product that forms as your body breaks down proteins.

BUN (Blood Urea Nitrogen), MedlinePlus, National Library of Medicine

Also listed as
urea nitrogen, blood urea nitrogen
Primary unit
mg/dL
LOINC codes
3094-0
Tests that measure BUN
Quest Diagnostics 21, Labcorp 15

Ranges

Compare the reference ranges labs publish with guideline targets, diagnostic cut-offs, study-based ranges and practitioner targets. Move across the rows to check a value against each range, and open a source from the legend. How to read these ranges

BUN, mg/dL

Labs
  • Lab reference ranges1 lab
All 1 published ranges, with sources

Lab reference ranges

Tests

Check the catalog code, specimen, method and preparation for every test that measures BUN. Select up to five tests to compare them side by side.

Quest Diagnostics 21 tests

Single-analyte tests

  • Urea Nitrogen (BUN) 294

    Serum · Fasting not stated · Turnaround Set up: Mon-Fri; Report available: 4 days

    Method and collection
    Method
    Spectrophotometry (SP)
    Reference notes
    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
    Quest Diagnostics catalog page

Panels that include this biomarker

  • Urea Clearance 7329

    2 analytes · Serum · Fasting not stated

    Method and collection
    Method
    Spectrophotometry (SP)
    Collection
    Aliquot from a well-mixed 24-hour collection. Record total volume on both the transport container and the test requisition.
    Reference notes
    Urea Nitrogen (BUN) 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 Urea Nitrogen, 24 Hour Urine 6-17 g/24 h Urea Nitrogen Clearance 41-68 mL/min
    Quest Diagnostics catalog page

  • BUN/Creatinine Ratio without EGFR 19111

    3 analytes · Serum · Fasting not stated

    Method and collection
    Method
    See individual tests
    Reference notes
    Urea Nitrogen (BUN) Age | Male (mg/dL) | Female (mg/dL) ≤27 days | 4-12 | 3-17 28 days-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. 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
    Quest Diagnostics catalog page

  • BUN/Creatinine Ratio 296

    4 analytes · Serum · Fasting not stated · Turnaround Set up: Mon-Sat; Report available: 3 days

    Method and collection
    Method
    See individual tests
    Reference notes
    ⁠⁠⁠⁠⁠⁠⁠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
    Quest Diagnostics catalog page

  • Basic Metabolic Panel without Calcium and Glomerular Filtration Rate, Estimated (eGFR) 19113

    8 analytes · Serum · Fasting not stated

    Method and collection
    Method
    See individual tests
    Reference notes
    See Laboratory Report
    Quest Diagnostics catalog page

  • Basic Metabolic Panel 10165

    9 analytes · Serum · Fasting not stated · Turnaround Set up: Mon-Sat; Report available: 3 days

    Method and collection
    Method
    See individual tests
    Preparation
    Fasting specimen is preferred
    Reference notes
    See Laboratory Report
    Quest Diagnostics catalog page

Labcorp 15 tests

Single-analyte tests

  • Urea Nitrogen 001040

    Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    Enzymatic (urease)
    Collection
    Separate serum or plasma from cells within 45 minutes of collection.
    Labcorp catalog page

Panels that include this biomarker

  • Urea Nitrogen Clearance 002329

    4 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    Enzymatic (urease)
    Collection
    Serum must be drawn during urine collection. Separate serum from cells within 45 minutes of collection.
    Labcorp catalog page

  • Metabolic Panel (8), Basic 322758

    10 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    See individual tests.
    Preparation
    Patient should fast for 12 hours preceding collection of specimen.
    Collection
    Draw blood in a gel-barrier tube and centrifuge. If red-top tube or green-top tube is used, centrifuge within 45 minutes of draw, remove the serum or plasma, and place in a transport tube and tightly stopper the tube.
    Labcorp catalog page

  • Renal Function Panel 322777

    12 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    See individual tests.
    Preparation
    Patient should fast overnight (12 hours preferred; eight hours acceptable) preceding collection of specimen.
    Collection
    Separate serum or plasma from cells within 45 minutes of collection.
    Labcorp catalog page

  • Kidney Profile Plus Metabolic Panel (8), Basic 140302

    13 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    See individual tests.
    Collection
    Separate serum or plasma from cells within 45 minutes of collection.
    Labcorp catalog page

  • Metabolic Panel (14), Comprehensive 322000

    17 analytes · Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    See individual tests.
    Preparation
    Patient should fast for 12 hours preceding collection of specimen.
    Collection
    Draw blood in gel-barrier tube and centrifuge. If red-top tube or green-top tube is used, centrifuge within 45 minutes of draw, remove the serum or plasma, and place in a transport tube and tightly stopper the tube.
    Labcorp catalog page

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Goals and conditions

We link BUN to these goals and conditions from named guidelines and studies.

Sources

Verify these ranges and sources

We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.

Interpret your own results with a licensed clinician, or track your lab history and health goals in Aumnivida.

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