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Red Cell Distribution Width (RDW-SD)
Blood
Red Cell Distribution Width (RDW-SD)
COMMON RANGE
39 – 46
fL
37.5
50
M
ARUP Laboratories
Adult
↗
See all sources ↓
Reference ranges across 10+ sources
Adult reference ranges from 3 entries across 3 trusted sources, shown in fL. Compare side-by-side.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
A
ARUP Laboratories
All
≥18
39 – 46 fL
↗
Q
Quest Diagnostics
All
≥18
39 – 46.5 fL
↗
L
Labcorp
All
≥18
38.5 – 49 fL
↗
A
ARUP Laboratories
All · ≥18
↗
39 – 46 fL
Q
Quest Diagnostics
All · ≥18
↗
39 – 46.5 fL
L
Labcorp
All · ≥18
↗
38.5 – 49 fL
Related biomarkers
Often tested alongside red cell distribution width (rdw-sd) 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
Q
Quest Diagnostics
L
Labcorp
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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