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Living with Hereditary persistence of fetal hemoglobin-sickle cell disease syndrome

A rare inherited blood condition, usually mild, in which fetal hemoglobin offsets sickle hemoglobin.

Understanding Hereditary persistence of fetal hemoglobin-sickle cell disease syndrome

Hereditary persistence of fetal hemoglobin-sickle cell disease syndrome is a rare inherited blood condition that is usually mild.

People have high fetal hemoglobin (HbF) along with sickle hemoglobin (HbS), and mildly small, pale red blood cells. Some people had sickle cell attacks such as acute chest syndrome and pain crises. Symptoms depend on how much HbF is in the blood cells. People with more than 35% HbF in all cells had no symptoms.

Signs & symptoms

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

  • Fetal hemoglobin that persists
  • Sickle hemoglobin (HbS) in the blood
  • Mild anemia
  • Belly pain, less often
  • Enlarged spleen, less often

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. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

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
What is my fetal hemoglobin level, and what does it mean for symptoms?
What should I do during a pain crisis?
Should my partner or relatives be tested?

Quick facts

Symptoms usually startany time in life
InheritanceAutosomal Recessive

GARD says changes in genes (also called variants) cause this condition. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticBlood

Also known as: hereditary persistence of fetal hemoglobin with sickle cell disease syndrome; hpfh-sickle cell disease syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Hereditary persistence of fetal hemoglobin-sickle cell disease syndromeGARD ID 18648 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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