Mosaic Trisomy 1 C5394675
A rare genetic condition where some cells have an extra chromosome 1 while others are normal. Features vary widely based on which cells carry the extra chromosome.
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
Global developmental delay
(neurological)Congenital heart defect
(cardiovascular)Facial dysmorphism
(craniofacial)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
Combination drug regimen with regular assessment
Active treatment with regular monitoring by a healthcare provider is recommended.
Developmental and Growth Surveillance
Comprehensive longitudinal monitoring of developmental milestones, growth parameters, and organ system function. Early identification of delays or abnormalities allows for timely intervention.
Neurodevelopmental Support Services
Early intervention services including developmental therapy, cognitive support, and family counseling. Addresses motor delays, learning differences, and behavioral concerns associated with chromosomal variation.
Additional treatment options
Corrective Surgical Procedures
Surgical intervention for specific structural abnormalities such as cardiac defects, cleft palate repair, or limb malformations when medically indicated and appropriate for the individual's overall health status.
surgicalMotor Development Therapy
Therapeutic exercises and techniques to address hypotonia, improve muscle tone, enhance coordination, and support achievement of motor milestones appropriate to the individual's abilities.
physical_therapyFamily Support and Resource Coordination
Connection to support services, genetic counseling, financial assistance programs, and parent support networks. Helps families navigate complex medical needs and access appropriate resources.
lifestyleWhen 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 Mosaic Trisomy 1 C5394675?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalMedication Comparisons
Compare medications used to treat Mosaic Trisomy 1 C5394675. 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