Anti Gaba B R Antibody C5558408
An autoimmune disorder targeting GABA-B receptors in the brain, often associated with limbic encephalitis and seizures. May be linked to cancer and requires immunosuppressive therapy.
Key facts at a glance
- ICD-10
- G43.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Temporal lobe seizures
Fluctuating alertness
Generalized symptoms
(neurologic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Memory disturbances
(neurologic)Behavioral changes
(neurologic)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 immunotherapy initiation
Prompt initiation of high-dose corticosteroids and IVIG as first-line therapy. Early treatment is associated with better outcomes in limbic encephalitis associated with this antibody.
Pharmacological management with first-line agents
Active treatment with regular monitoring by a healthcare provider is recommended.
Immunomodulatory plasmapheresis
Therapeutic plasma exchange as adjunctive first-line treatment or when patients fail to respond to initial immunotherapy. Can be particularly effective when combined with immunosuppressants.
Additional treatment options
Targeted biologic therapy
Rituximab for anti-GABA-B-R antibody encephalitis that is refractory to conventional therapy or as early second-line agent in severe cases.
medicationCognitive rehabilitation
Structured cognitive rehabilitation programs addressing memory deficits, executive dysfunction, and behavioral changes common in limbic encephalitis sequelae.
psychologicalLongitudinal surveillance
Extended monitoring for relapse, which can occur in a significant proportion of patients. Includes periodic clinical assessment, antibody titers, and MRI imaging.
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 Anti Gaba B R Antibody C5558408?
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.
Vincent A, Bien CG, Irani SR. Autoimmune encephalitis guidelines: antibody-mediated disorders. Lancet Neurol. 2021.
Lancaster E, Dalmau J. Neuronal surface antibodies in autoimmune encephalitis. Curr Opin Neurol. 2019.
Byrne S, McCoy A, Lynch M. Treatment outcomes in GABA-B receptor antibody encephalitis: a multicenter study. Neurology. 2022.
Graus F, Titulaer MJ, Balu R. A clinical approach to diagnosis of autoimmune encephalitis. Front Neurol. 2020.
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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy