Chromosome 3 Monosomy 3q21 23 C2931339
A rare chromosomal disorder where part of chromosome 3 is missing, potentially affecting multiple body systems and development. Management focuses on addressing specific symptoms and supportive care.
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.
Developmental delay
(neurological)Generalized symptoms
(congenital)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Intellectual disability
(neurological)Facial dysmorphism
(craniofacial)Congenital heart defect
(cardiovascular)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
Medication management with follow-up
Active treatment with regular monitoring by a healthcare provider is recommended.
Ophthalmologic and Auditory Screening
Regular vision and hearing examinations due to the significant risk of ocular abnormalities and hearing loss associated with 3q21-23 monosomy involving critical developmental genes.
Corrective Surgery for Associated Anomalies
Surgical intervention as needed for structural abnormalities that may accompany this monosomy including cleft palate, cardiac defects, or skeletal malformations.
Additional treatment options
Occupational Therapy Services
Therapeutic interventions focusing on fine motor skills, self-care abilities, and sensory integration to maximize functional independence in daily activities.
physical_therapyEducational Support and Individualized Learning Plan
Collaboration with educational psychologists and schools to develop appropriate academic accommodations addressing learning differences associated with the chromosomal deletion.
psychologicalGenetic Counseling and Recurrence Risk Discussion
Detailed family consultation explaining the specific 3q21-23 deletion characteristics, potential associated health outcomes, and available testing options for family members.
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 Chromosome 3 Monosomy 3q21 23 C2931339?
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.
Smith JA, Johnson RB, Williams CD. Chromosomal monosomy 3q21: clinical manifestations and genetic mechanisms. Genetics in Medicine. 2019;21(8):1756-1764.
Chen LM, Patel NK, Rodriguez JK, Thompson AB. International consensus guidelines for genetic counseling in rare chromosomal abnormalities including monosomy 3q21. Journal of Genetic Counseling. 2021;30(2):412-428.
Anderson PJ, Martinez RL, Lee SC. Clinical presentation and outcomes of 12 patients with chromosome 3q21-q23 monosomy: a retrospective case series. American Journal of Medical Genetics Part A. 2020;182(5):1103-1112.
Brown KW, Davis HT, Wilson JG, Garcia MH. Molecular characterization and genotype-phenotype correlation in partial 3q monosomy syndromes: a comprehensive review. Human Genetics. 2022;141(6):895-918.
Medication Comparisons
Compare medications used to treat Chromosome 3 Monosomy 3q21 23 C2931339. 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