Voltage Gated K Chan Abs
The VGKC antibody test detects immune antibodies targeting potassium channel–related proteins in the nervous system. It supports diagnosis of autoimmune neurological syndromes.
Turnaround time
4 weeks
Biomarkers count
1
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Details about Voltage Gated K Chan Abs
What is the Voltage-Gated Potassium Channel (VGKC) Antibodies test?
The VGKC antibodies test measures immune antibodies directed against proteins associated with voltage-gated potassium channels in the nervous system. These channels regulate nerve signalling and muscle activity, and abnormal immune targeting can disrupt normal neurological function.
Historically, the test detected antibodies labelled as “VGKC,” which are now understood to most commonly target associated proteins such as LGI1 and CASPR2. These antibodies are linked to specific autoimmune neurological syndromes rather than the potassium channel itself.
Clinically, this blood test is used to support the diagnosis of autoimmune encephalitis and related neurological conditions, particularly when symptoms develop subacutely and imaging or routine tests are inconclusive.
Why do I need a test for VGKC antibodies?
Autoimmune neurological disorders can mimic infections, psychiatric illness, or degenerative disease. VGKC-related antibodies are important because early diagnosis and treatment can significantly improve outcomes.
Testing is recommended when symptoms suggest immune-mediated nervous system involvement, especially if onset is rapid or fluctuating. Identifying antibodies helps guide specialist referral and immunotherapy decisions.
You may need a VGKC antibodies test if you experience:
- New-onset seizures without a clear cause
- Memory loss or confusion
- Personality or behavioural changes
- Muscle twitching or stiffness
- Peripheral nerve pain or weakness
- Sleep disturbance or autonomic symptoms
- Suspected autoimmune encephalitis
Benefits of the VGKC antibodies test
- Supports autoimmune encephalitis diagnosis
Helps identify immune-mediated causes of neurological symptoms. - Guides early specialist treatment
Early detection can lead to timely immunotherapy. - Differentiates autoimmune from other causes
Helps distinguish from infection or degenerative disease. - Explains unexplained seizures
Particularly useful in adult-onset epilepsy. - Supports cognitive symptom investigation
Relevant for memory and behavioural changes. - Non-invasive blood test
Requires a simple blood sample. - Aids treatment monitoring
Can support clinical follow-up in some cases. - Improves diagnostic confidence
Adds objective evidence to complex neurological cases.
Step-by-step – How we offer this test
Option 1: Clinic-based blood test (UK-wide)
- Choose your nearest UK clinic
- Attend your appointment
- A clinician draws a blood sample
- Sample sent for specialist antibody analysis
Option 2: Home or hotel visit (+£60, UK-wide)
- A qualified phlebotomist comes to your location
- Blood sample taken at home or in your hotel
- No need to travel
- Same laboratory processing and reporting
Your results explained
Low / Negative VGKC antibody levels
Low or negative levels suggest no significant evidence of VGKC-related autoimmune activity.
UK reference range (negative):
- < 100 pmol/L
Autoimmune VGKC-related disease is unlikely based on this result alone.
Borderline VGKC antibody levels
Borderline results may be non-specific and should be interpreted alongside symptoms and other investigations.
UK reference range (borderline):
- 100 – 400 pmol/L
Further testing (e.g. LGI1 or CASPR2 antibodies) may be recommended.
High / Positive VGKC antibody levels
High levels indicate significant autoimmune antibody activity and are associated with VGKC-related neurological syndromes.
UK reference range (positive):
- > 400 pmol/L
Positive results usually prompt urgent neurology referral and further specialist evaluation.
How It Works
Simple steps to get your results
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Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
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Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.