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Living with Congenital dyserythropoietic anemia, type III

A rare inherited blood condition with mild to moderate anemia caused by oddly large red blood cell precursors in the bone marrow.

Understanding Congenital dyserythropoietic anemia, type III

Congenital dyserythropoietic anemia (CDA) type III is a rare form of CDA with mild to moderate anemia.

Bone marrow tests show unusually large immature red blood cells with more than one nucleus. It can start at any time in life.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Anemia (low red blood cells or hemoglobin)
  • Tiredness (fatigue)
  • Red blood cells of unequal size
  • Larger-than-usual red blood cells
  • Oddly shaped red blood cells

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include blood and bone marrow specialists and genetic specialists.

  3. Consider genetic testing

    Changes in KIF23 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Blood and bone marrow specialists (hematologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should we have genetic testing for the KIF23 gene?
How often should blood counts be checked?
When might treatment be needed?

Quick facts

Symptoms usually startany time in life
InheritanceAutosomal Dominant, Autosomal Recessive
GenesKIF23

Changes in the KIF23 gene are listed. GARD lists both autosomal dominant and autosomal recessive inheritance.

GeneticBlood

Also known as: anemia with multinucleated erythroblasts; cda iii; cda type 3; cda type iii; cdan3a; congenital dyserythropoietic anemia type 3

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Congenital dyserythropoietic anemia, type IIIGARD ID 2002 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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