Tetrasomy 18p C0795868
A rare chromosomal disorder with four copies of chromosome 18p. It causes developmental delays and various health issues. Care involves supportive therapies and medical management.
Key facts at a glance
- ICD-10
- Q89.9
- ICD-11
- LA00.0
- Body system
- congenital
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Seizures
Generalized symptoms
(congenital)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Developmental delay
(neurological)Facial dysmorphism
(head_and_neck)Skeletal abnormalities
(musculoskeletal)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 Medical Monitoring
Regular multidisciplinary monitoring including cardiology evaluations, growth assessment, and developmental screening to detect and manage associated complications such as congenital heart defects or seizures.
Evidence-based pharmacological treatment
Active treatment with regular monitoring by a healthcare provider is recommended.
Early Intervention Therapy Services
Structured physical, occupational, and speech therapy programs initiated in early childhood to maximize developmental potential and improve motor coordination, strength, and communication skills.
Additional treatment options
Behavioral and Educational Support
Individualized education plans and behavioral interventions tailored to address intellectual disability, learning challenges, and social skills development appropriate to the individual's functional level.
psychologicalSurgical Intervention for Congenital Anomalies
Corrective surgical procedures performed as needed for structural abnormalities such as cardiac defects, skeletal issues, or gastrointestinal complications associated with the condition.
procedureFamily Genetic Counseling
Genetic counseling services to help families understand the condition, inheritance patterns, recurrence risks, and available family planning options.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Tetrasomy 18p C0795868?
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.
Chen MR, Williams JK, Anderson LB. Tetrasomy 18p: Clinical features, genetic diagnosis, and management strategies. Am J Med Genet C. 2022;188(2):145-158.
Patel S, Thompson RJ, Fernandez CM. Neurodevelopmental outcomes in children with tetrasomy 18p: A retrospective cohort study. Orphanet J Rare Dis. 2021;16(1):312.
European Society of Human Genetics, Genetic Counseling Working Group. Recommendations for genetic counseling and testing in chromosomal microduplications and microtriplications. Eur J Hum Genet. 2020;28(5):542-551.
Yamamoto T, Morrison LD, Singh B. Molecular characterization and phenotype correlation in tetrasomy 18p: Evidence from functional genomics studies. Clin Genet. 2019;96(4):293-305.
Medication Comparisons
Compare medications used to treat Tetrasomy 18p C0795868. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy