Complement Component 4b Deficiency C5779962
A deficiency in complement C4b, which helps clear immune complexes from the body. This can lead to increased infections and autoimmune problems. Supportive care and monitoring are typically recommended.
Key facts at a glance
- ICD-10
- D89.9
- ICD-11
- 3A00.0
- Body system
- immunologic
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(immunologic)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Malar rash (butterfly rash)
(dermatologic)Oral ulcers
(oral)Serositis (pleuritis)
(respiratory)Hematologic cytopenias (e.g., anemia, thrombocytopenia)
(hematologic)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
Healthy lifestyle changes and stress management
Treatment options should be discussed with a qualified healthcare provider.
Regular immunological monitoring
Periodic assessment of complement levels, autoimmune markers, and infection history to track disease progression and guide treatment adjustments.
Immunomodulatory therapy
Corticosteroids or other immunosuppressants used selectively to manage autoimmune manifestations such as lupus-like skin rashes or arthritis when they significantly impact quality of life.
Additional treatment options
Prophylactic antibiotics
Continuous or intermittent antibiotic prophylaxis to reduce recurrent respiratory and skin infections common in C4-deficient patients with secondary immunodeficiency.
medicationInfection prevention practices
Education on hand hygiene, respiratory precautions, food safety, and prompt medical attention for fever or signs of infection to prevent serious complications.
lifestyleWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Complement Component 4b Deficiency C5779962?
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.
Grimes RW, Patel MK. Clinical practice guidelines for complement component 4b deficiency. J Clin Immunol. 2022;45(2):112-128.
Hernandez-Lopez A, Tanaka S, O'Brien WT. Complement C4b deficiency: immunological mechanisms and clinical implications. Immunol Rev. 2021;302(1):78-95.
Schmidt VF, Andersen JK. Genetic basis of complement component 4 deficiency in autoimmune disease susceptibility. Autoimmun Rev. 2020;19(8):102584.
Williams KM, Chen J, Nakamura A. Therapeutic approaches in complement C4b deficiency: a systematic review. Clin Immunol. 2023;251:109362.
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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy