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Living with Rh deficiency syndrome

A rare inherited blood condition where red blood cells lack Rh proteins, often causing mild anemia and blood transfusion risks.

Understanding Rh deficiency syndrome

Rh deficiency syndrome, also called Rh-null syndrome, is a rare blood condition in which red blood cells lack all Rh antigens.

Rh antigens help keep the red blood cell wall strong. Without them, red cells have an unusual shape, break down more easily, and live a shorter time. This causes anemia (hemolytic anemia) that is usually mild. People with it can react badly to transfusions and can only receive blood from others with the same condition.

Signs & symptoms

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

  • Hemolytic anemia (red cells break down early)
  • Red cells with an unusual shape
  • More immature red blood cells in the blood
  • Red cells that break easily

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 RHAG 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
Which type of Rh deficiency do I have?
How can I plan safely for transfusions or surgery?
Should family members be tested?

Quick facts

InheritanceAutosomal Recessive
GenesRHAG

There are two types. One is linked to changes in the RHAG gene, and the other to inactive copies of a gene at the RH locus. It is autosomal recessive, so a child inherits a changed copy from each parent.

GeneticBlood

Also known as: anemia, hemolytic, rh-null, regulator type; rh-null syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Rh deficiency syndromeGARD ID 12916 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Rh deficiency syndrome.

Explore the Rh deficiency syndrome blog

Explore research for Rh deficiency syndrome

Explore actively recruiting Rh deficiency syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Rh deficiency syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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