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Bicarbonate (CO₂)
Blood
Bicarbonate (CO₂)
COMMON RANGE
22 – 29
mEq/L
2.3
34.7
M
Mayo Clinic Laboratories
Adult
↗
See all sources ↓
CONVERT & COMPARE
mEq/L
=
26
mmol/L
Reference ranges across 10+ sources
Adult reference ranges from 6 entries across 6 trusted sources, shown in mEq/L. Compare side-by-side.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
A
ARUP Laboratories
All
≥18
21 – 31 mEq/L
↗
M
Mayo Clinic Laboratories
All
≥18
22 – 29 mEq/L
↗
Q
Quest Diagnostics
All
≥18
21 – 31 mEq/L
↗
L
Labcorp
All
≥18
22 – 30 mEq/L
↗
R
RCPA / AACB Australasian Harmonised Reference Intervals
All
≥18
22 – 32 mEq/L
↗
U
UK Pathology Harmony
All
≥18
22 – 29 mEq/L
A
ARUP Laboratories
All · ≥18
↗
21 – 31 mEq/L
M
Mayo Clinic Laboratories
All · ≥18
↗
22 – 29 mEq/L
Q
Quest Diagnostics
All · ≥18
↗
21 – 31 mEq/L
L
Labcorp
All · ≥18
↗
22 – 30 mEq/L
R
RCPA / AACB Australasian Harmonised Reference Intervals
All · ≥18
↗
22 – 32 mEq/L
U
UK Pathology Harmony
All · ≥18
22 – 29 mEq/L
Ages 0–17 (CALIPER)
PEDIATRIC
6 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
5 – 20 mEq/L
↗
C
CALIPER — Canadian Pediatric Reference Intervals
All
0.04–1
10 – 24 mEq/L
↗
C
CALIPER — Canadian Pediatric Reference Intervals
All
1–5
14 – 24 mEq/L
↗
C
CALIPER — Canadian Pediatric Reference Intervals
All
5–15
17 – 26 mEq/L
↗
C
CALIPER — Canadian Pediatric Reference Intervals
Female
15–19
17 – 26 mEq/L
↗
C
CALIPER — Canadian Pediatric Reference Intervals
Male
15–19
18 – 28 mEq/L
↗
C
CALIPER — Canadian Pediatric Reference Intervals
All · 0–0.04
↗
5 – 20 mEq/L
C
CALIPER — Canadian Pediatric Reference Intervals
All · 0.04–1
↗
10 – 24 mEq/L
C
CALIPER — Canadian Pediatric Reference Intervals
All · 1–5
↗
14 – 24 mEq/L
C
CALIPER — Canadian Pediatric Reference Intervals
All · 5–15
↗
17 – 26 mEq/L
C
CALIPER — Canadian Pediatric Reference Intervals
Female · 15–19
↗
17 – 26 mEq/L
C
CALIPER — Canadian Pediatric Reference Intervals
Male · 15–19
↗
18 – 28 mEq/L
Related biomarkers
Often tested alongside bicarbonate (co₂) 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
R
RCPA / AACB Australasian Harmonised Reference Intervals
U
UK Pathology Harmony
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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