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Blood Urea Nitrogen (BUN)
Blood
Blood Urea Nitrogen (BUN)
COMMON RANGE
8 – 24
mg/dL
0.68
26.1
M
Mayo Clinic Laboratories
Adult Male
↗
See all sources ↓
CONVERT & COMPARE
mg/dL
=
5.71
mmol/L
Reference ranges across 10+ sources
Adult reference ranges from 11 entries across 10 trusted sources, shown in mg/dL. Compare side-by-side.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
A
ARUP Laboratories
All
≥18
6 – 24 mg/dL
↗
M
Mayo Clinic Laboratories
Male
≥18
8 – 24 mg/dL
↗
M
Mayo Clinic Laboratories
Female
≥18
6 – 21 mg/dL
↗
Q
Quest Diagnostics
All
≥18
6 – 24 mg/dL
↗
L
Labcorp
All
≥18
6 – 24 mg/dL
↗
W
World Health Organization
All
≥18
7 – 20 mg/dL
↗
R
RCPA / AACB Australasian Harmonised Reference Intervals
All
≥18
7 – 20 mg/dL
↗
N
Nordic Reference Interval Project
All
≥18
8 – 23 mg/dL
↗
U
UK Pathology Harmony
All
≥18
7 – 22 mg/dL
J
JSCC / JAMT Japan
All
≥18
8 – 20 mg/dL
T
Turkey Nationwide Reference Intervals
All
≥18
7 – 22 mg/dL
A
ARUP Laboratories
All · ≥18
↗
6 – 24 mg/dL
M
Mayo Clinic Laboratories
Male · ≥18
↗
8 – 24 mg/dL
M
Mayo Clinic Laboratories
Female · ≥18
↗
6 – 21 mg/dL
Q
Quest Diagnostics
All · ≥18
↗
6 – 24 mg/dL
L
Labcorp
All · ≥18
↗
6 – 24 mg/dL
W
World Health Organization
All · ≥18
↗
7 – 20 mg/dL
R
RCPA / AACB Australasian Harmonised Reference Intervals
All · ≥18
↗
7 – 20 mg/dL
N
Nordic Reference Interval Project
All · ≥18
↗
8 – 23 mg/dL
U
UK Pathology Harmony
All · ≥18
7 – 22 mg/dL
J
JSCC / JAMT Japan
All · ≥18
8 – 20 mg/dL
T
Turkey Nationwide Reference Intervals
All · ≥18
7 – 22 mg/dL
Ages 0–17 (CALIPER)
PEDIATRIC
5 age- and sex-stratified entries from the Canadian Laboratory Initiative on Pediatric Reference Intervals.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
C
CALIPER — Canadian Pediatric Reference Intervals
All
0–0.04
2.8 – 23 mg/dL
↗
C
CALIPER — Canadian Pediatric Reference Intervals
All
0.04–1
3.4 – 16.8 mg/dL
↗
C
CALIPER — Canadian Pediatric Reference Intervals
All
1–10
9 – 22.1 mg/dL
↗
C
CALIPER — Canadian Pediatric Reference Intervals
Female
10–19
7.3 – 19 mg/dL
↗
C
CALIPER — Canadian Pediatric Reference Intervals
Male
10–19
7.3 – 21 mg/dL
↗
C
CALIPER — Canadian Pediatric Reference Intervals
All · 0–0.04
↗
2.8 – 23 mg/dL
C
CALIPER — Canadian Pediatric Reference Intervals
All · 0.04–1
↗
3.4 – 16.8 mg/dL
C
CALIPER — Canadian Pediatric Reference Intervals
All · 1–10
↗
9 – 22.1 mg/dL
C
CALIPER — Canadian Pediatric Reference Intervals
Female · 10–19
↗
7.3 – 19 mg/dL
C
CALIPER — Canadian Pediatric Reference Intervals
Male · 10–19
↗
7.3 – 21 mg/dL
Related biomarkers
Often tested alongside blood urea nitrogen (bun) or part of the same panel.
White Blood Cells (WBC)
Blood
Red Blood Cells (RBC)
Blood
Hemoglobin (Hgb)
Blood
Hematocrit (Hct)
Blood
Platelets (PLT)
Blood
Mean Corpuscular Volume (MCV)
Blood
Sources
A
ARUP Laboratories
M
Mayo Clinic Laboratories
Q
Quest Diagnostics
L
Labcorp
W
World Health Organization
R
RCPA / AACB Australasian Harmonised Reference Intervals
N
Nordic Reference Interval Project
U
UK Pathology Harmony
J
JSCC / JAMT Japan
T
Turkey Nationwide Reference Intervals
C
CALIPER — Canadian Pediatric Reference Intervals
Last updated 2026-05-02
This page aggregates publicly available reference data and clinical information from Mayo Clinic Laboratories and other sources. For general wellness information only — not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.
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