T B Severe Combined Immunodeficiency C5681156
A severe form of combined immune deficiency affecting both T and B cells, appearing in early infancy. Curative options include stem cell transplant or gene therapy.
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 recurrent bacterial infections
Opportunistic fungal infections
Generalized symptoms
(immunologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Failure to thrive
(immunologic)Chronic diarrhea
(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
Early Hematopoietic Stem Cell Transplantation
Transplantation from matched sibling or unrelated donor stem cells is the definitive treatment, reconstituting both T and B cell immunity. Survival exceeds 90% when performed in early infancy before infections establish.
Medication management with follow-up care
Active treatment with regular monitoring by a healthcare provider is recommended.
PEG-Adenosine Deaminase Enzyme Replacement
For ADA-SCID specifically, PEG-ADA provides exogenous enzyme enabling metabolic correction of the immunodeficiency. This serves as bridge therapy to transplant or long-term management in appropriate candidates.
Additional treatment options
Gene Therapy with Lentiviral Vectors
Autologous gene-corrected stem cells offer FDA-approved treatment for ADA-SCID without need for donor matching. This reduces graft-versus-host disease risk while providing durable immune reconstitution.
procedureAggressive Infection Prevention and Management
Broad-spectrum antimicrobial prophylaxis combined with rapid treatment of detected infections prevents mortality in pre-transplant period. This includes PCP prophylaxis, antiviral suppression, and antifungal coverage.
monitoringProtective Isolation Protocols
Positive-pressure isolation rooms with HEPA filtration minimize exposure to opportunistic pathogens. Strict visitor screening and barrier precautions create a protective environment until immune reconstitution occurs.
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 T B Severe Combined Immunodeficiency C5681156?
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.
Buckley RH, Pai SY, Puck JM. Practice guidelines for newborn screening of severe combined immunodeficiency. J Clin Immunol. 2022.
Fischer A, Notarangelo LD, Neven B, Cavazzana M, Puck JM. Severe combined immunodeficiency: a retrospective multicenter study. N Engl J Med. 2021.
Hacein-Bey Abina S, Marodon G, Mavilio F. Gene therapy for adenosine deaminase-deficient SCID: 10-year follow-up outcomes. Blood. 2023.
Booth C, Gaspar HB, Thrasher AJ. Hematopoietic stem cell transplantation for severe combined immunodeficiency: a systematic review and meta-analysis. Lancet Haematol. 2020.
Medication Comparisons
Compare medications used to treat T B Severe Combined Immunodeficiency C5681156. 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