Red Cell Distribution Width - Standard Deviation

HematologyBlood HealthBlood

A measure of red blood cell size variability

Why it matters: Helps differentiate between types of anemia and assess bone marrow function

Reference Range
39.0 – 46.0fL
39
46LowNormalHigh
What Moves It

May increase with:

Iron deficiency anemia
Vitamin B12 deficiency
Hemolytic anemia

May decrease with:

Sideroblastic anemia
Chronic disease anemia
Associated Conditions
AnemiaMyelodysplastic syndromeThalassemia
Related Markers
RDWHemoglobinMCH
Common questions

What is Red Cell Distribution Width - Standard Deviation?

A measure of red blood cell size variability

What might a high or low Red Cell Distribution Width - Standard Deviation mean?

Helps differentiate between types of anemia and assess bone marrow function

What is the typical reference range for Red Cell Distribution Width - Standard Deviation?

The general-population reference range shown here is 39 – 46 fL. Reference ranges describe the general population and are not a personal target — discuss your results with your physician.

What can affect Red Cell Distribution Width - Standard Deviation?

It may be higher with: Iron deficiency anemia, Vitamin B12 deficiency, Hemolytic anemia. It may be lower with: Sideroblastic anemia, Chronic disease anemia.

More in Hematology
Fetal HemoglobinGranulocytesGranulocytes PercentageHemoglobin A2Immature GranulocytesImmature Granulocytes %Mid-Range Cells CountMid-Range Cells PercentageNucleated Red Blood Cells

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