Markedly Reduced T Cell Function C1834098
A condition where the immune system lacks sufficient functional T cells to fight infections. Can result from genetic conditions or other diseases. Treatment depends on the cause and may include transplant.
Key facts at a glance
- ICD-10
- D89.9
- ICD-11
- 3A00.0
- Body system
- immunologic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Severe mucocutaneous herpesvirus infection
Granulomatous skin lesions
Generalized symptoms
(immunologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Recurrent upper respiratory tract infections
(immunologic)Chronic sinusitis
(immunologic)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
Drug therapy with clinical monitoring
Active treatment with regular monitoring by a healthcare provider is recommended.
Immunoglobulin replacement therapy
Regular intravenous or subcutaneous immunoglobulin infusions to provide passive humoral immunity and compensate for T-cell dependent antibody deficiencies.
Antimicrobial prophylaxis
Prophylactic antibiotics and antivirals to prevent common opportunistic infections that patients with T-cell dysfunction are susceptible to.
Additional treatment options
Hematopoietic stem cell transplantation
Curative approach to restore functional T-cell immunity through bone marrow or cord blood transplantation from matched donors.
surgicalInfection prevention strategies
Comprehensive lifestyle modifications including rigorous hand hygiene, food safety practices, avoidance of sick contacts, and environmental precautions to reduce infection exposure.
lifestyleImmunological monitoring program
Regular assessment of lymphocyte subsets, immunoglobulin levels, vaccine responses, and infection frequency to guide therapy adjustments and detect complications early.
monitoringWhen 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 Markedly Reduced T Cell Function C1834098?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
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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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy