Living with Four X syndrome
A chromosome condition in females with four copies of the X chromosome, which can cause learning and speech difficulties and other health differences.
Understanding Four X syndrome
Females have 48 chromosomes in their cells instead of 46. Signs vary but can include mild to moderate speech and learning difficulties, developmental delay, distinctive facial features, dental differences, low muscle tone, heart defects, hip dysplasia, and ovary problems. It is caused by a random error during egg cell development, not by anything the mother did in pregnancy.
Signs & symptoms
Symptoms vary from person to person. GARD lists these among the most common:
- Delayed development
- Learning disabilities and speech difficulties
- Low muscle tone (hypotonia)
- Very flexible joints
- Fused forearm bones (radioulnar synostosis)
- Dental differences
Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.
Diagnosis
- 1Talk with your doctor
Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.
- 2See a specialist
Specialists who may be involved include genetic specialists, hormone specialists, maternal-fetal medicine specialists and women’s reproductive health specialists.
- 3Ask which tests can help
Your care team will decide which exams and tests can confirm the diagnosis.
- 4Connect with expert centers
Association for X and Y Chromosome Variations and Resolve: The National Infertility Association may keep lists of experts for this condition.
Care & treatment
- Care team
- Genetic specialists (geneticists); Hormone specialists (endocrinologists); Maternal-fetal medicine specialists (pregnancy-related); Women’s reproductive health specialists (obstetricians / gynecologists)
- Expert care
- Expert lists: Association for X and Y Chromosome Variations, Resolve: The National Infertility Association
- 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 Association for X and Y Chromosome Variations and other patient organizations
- 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
Quick facts
It is caused by having four copies of the X chromosome, from a random error during the development of an egg cell. It is not caused by anything a mother does during pregnancy.
Also known as: 48,xxxx syndrome; quadruple x; tetra x; tetrasomy type x; tetrasomy x; tetrasomy x syndrome
Patient organizations
- Association for X and Y Chromosome VariationsFour X syndrome · United States
- Chromodiversity FoundationFour X syndrome · Chromosome Disorder Outreach
- Resolve: The National Infertility AssociationInfertility · United States
You are more than your diagnosis
Perspectives from people navigating life with Four X syndrome.
Explore research for Four X syndrome
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- Recruiting studies from ClinicalTrials.gov
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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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