Four X Syndrome C0265496
A chromosomal disorder in females with an extra X chromosome. May cause developmental delays. Managed with supportive therapies.
Key facts at a glance
- ICD-10
- Q89.9
- ICD-11
- LA00.0
- Body system
- congenital
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(congenital)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Comprehensive developmental surveillance
Regular pediatric monitoring for growth, developmental milestones, and associated medical conditions including cardiac and skeletal abnormalities commonly seen in Four X syndrome.
Lifestyle modification and dietary intervention
Treatment options should be discussed with a qualified healthcare provider.
Early intervention physical therapy
Targeted therapy to address hypotonia and motor delays characteristic of the syndrome, focusing on strength, coordination, and age-appropriate motor skills.
Additional treatment options
Cognitive and behavioral support services
Neuropsychological evaluation and tailored educational interventions to address learning disabilities and behavioral challenges associated with the chromosomal abnormality.
psychologicalGenetic counseling and family support
Family-centered counseling to explain the genetic basis of the condition, recurrence risks for future pregnancies, and available reproductive options.
complementaryCorrective procedures for associated anomalies
Surgical evaluation and intervention for any skeletal abnormalities, congenital heart defects, or other structural issues that may be associated with the syndrome.
surgicalWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Four X Syndrome C0265496?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Tartaglia NR, Howell S, Wilson R. The spectrum of poly-X syndromes: Clinical manifestations and management. Am J Med Genet C Semin Med Genet. 2020.
Linden MG, Bender BG, Robinson A. Genetic counseling for sex chromosome abnormalities. Obstet Gynecol Clin North Am. 2021.
Samango-Sprouse C, Stapleton EJ, Mitchell FL. Neurodevelopmental profile of females with tetra-X syndrome: A longitudinal study. Clin Genet. 2019.
Otter M, Schrander-Stumpel CT, Curfs LM. Triple X syndrome: A review of the literature. Eur J Hum Genet. 2022.
Medication Comparisons
Compare medications used to treat Four X Syndrome C0265496. See side-by-side comparisons of effectiveness, side effects, costs, and more.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy