IgG, Syn Rate,CSF
The IgG Synthesis Rate (CSF) measures how much immunoglobulin G (IgG) is being actively produced within the central nervous system (CNS)—specifically the brain and spinal cord. It helps determine whether the immune system is generating antibodies inside the CNS, which can signal inflammation, infection, or autoimmune activity affecting the brain or spinal cord.
Why it matters:
While some IgG naturally crosses from the blood into the cerebrospinal fluid (CSF), an elevated IgG synthesis rate means the immune system is producing extra IgG locally within the CNS. This is a hallmark of conditions like multiple sclerosis (MS), chronic CNS infections, or autoimmune neuroinflammatory diseases.
How it’s calculated:
The IgG synthesis rate is calculated using levels of:
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IgG in the CSF and serum
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Albumin in the CSF and serum
The result estimates how much IgG is being produced inside the CNS, rather than just leaking in from the bloodstream.
What an Elevated IgG Synthesis Rate May Indicate:
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Multiple Sclerosis (MS): Often shows both increased synthesis rate and positive oligoclonal bands.
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Chronic CNS Infections: Such as HIV, syphilis, Lyme neuroborreliosis, or tuberculous meningitis.
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Autoimmune Diseases: Inflammatory conditions like neurosarcoidosis or lupus with CNS involvement.
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Other CNS disorders: Chronic inflammatory demyelinating polyneuropathy (CIDP), encephalitis.
Reference Range and Interpretation:
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A normal IgG synthesis rate varies slightly by lab but is typically below 3.3 mg/day.
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A higher value suggests active immune response in the CNS and should be evaluated alongside clinical symptoms and additional tests like MRI or oligoclonal bands.
Takeaway:
The CSF IgG Synthesis Rate is a valuable tool in diagnosing and monitoring diseases that involve the immune system attacking or reacting within the brain or spinal cord. Elevated levels point to ongoing antibody production within the CNS, which can help confirm conditions like MS or chronic neurological infections. Interpretation should always be done by a healthcare professional in the context of a full clinical picture.
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