T B Severe Combined Immunodeficiency C5679893
A severe immune deficiency where both T and B cell function is absent or severely impaired. Infants are typically diagnosed in the first months of life due to recurrent infections. Bone marrow or stem cell transplantation can be curative if performed early.
Key facts at a glance
- ICD-10
- D89.9
- ICD-11
- 3A00.0
- Body system
- immunologic
- Severity
- critical
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Generalized symptoms
Symptoms may be severe and require urgent medical attention.
Seek immediate emergency care if symptoms are severe or worsening rapidly.
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
Hematopoietic Stem Cell Transplantation
Early hematopoietic stem cell transplantation from a matched sibling or unrelated donor is the primary curative treatment for SCID, replacing the defective immune system with functional cells.
Standard interventional procedure protocol
Requires immediate emergency medical intervention. Do not delay treatment.
Immunoglobulin Replacement Therapy
Regular intravenous or subcutaneous immunoglobulin infusions provide passive immunity against common pathogens while awaiting immune reconstitution from definitive treatment.
Additional treatment options
Gene Therapy
For patients without a suitable donor, gene therapy can introduce functional copies of the defective gene into the patient's hematopoietic stem cells, potentially curing the underlying genetic defect.
procedureProtective Isolation
Strict infection prevention measures including HEPA filtration, protective barriers, and restricted visitors help prevent life-threatening infections until immune function is restored.
lifestyleProphylactic Antimicrobial Therapy
Combination antibiotic, antiviral, and antifungal prophylaxis helps prevent opportunistic infections commonly fatal in SCID patients during the vulnerable period.
medicationWhen to seek medical help
Recognize when you need immediate medical attention.
Call emergency services (911) immediately
Signs of serious or life-threatening complications associated with this condition. Immediate medical evaluation is required.
Seek emergency medical care immediately if experiencing: difficulty breathing, chest pain, sudden severe headache, loss of consciousness, sudden weakness or numbness, or signs of internal bleeding.
Frequently asked questions
Common questions about this topic.
What is T B Severe Combined Immunodeficiency C5679893?
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.
Puck JM, Young K, Cunningham-Rundles C. Practice guidelines for immunodeficiency: severe combined immunodeficiency. J Clin Immunol. 2021.
Haddad E, Griffith LM, Cowan MJ. Hematopoietic stem cell transplantation for severe combined immunodeficiency: a prospective clinical trial. N Engl J Med. 2020.
Dvorak CC, Puck JM, Wahlstrom JT. Severe combined immunodeficiency: advances in diagnosis and treatment. Immunol Allergy Clin North Am. 2022.
Bucks CM, Goyal DK, Nannya Y. Gene therapy outcomes in severe combined immunodeficiency: a systematic review and meta-analysis. Blood. 2023.
Medication Comparisons
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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 27, 2026. · Read our editorial policy