VOLTAGE GATED CALCIUM CHANNEL (VGCC)TYPE N AB
Optimal Result:
0 - 54 pmol/L.
Voltage-Gated Calcium Channel Type N Antibodies are immune proteins that target N-type voltage-gated calcium channels, which are involved in calcium movement across nerve cell membranes and play a role in neurotransmitter release. These antibodies may appear as part of broader autoimmune or paraneoplastic neurological testing, especially when a person has symptoms such as muscle weakness, fatigue that improves with repeated use, autonomic symptoms, neuropathy, ataxia, or other unexplained neurological findings. VGCC antibodies as a group have historically been associated with conditions such as Lambert-Eaton myasthenic syndrome, paraneoplastic neurological syndromes, cerebellar ataxia, peripheral neuropathy, autonomic neuropathy, and neurological autoimmunity, particularly in people with a history of cancer or clinical concern for a cancer-associated immune response.
A positive VGCC Type N Ab result does not diagnose a disease by itself. Type N antibodies are generally considered less specific than P/Q-type VGCC antibodies, which are more strongly established in Lambert-Eaton myasthenic syndrome. A 2025 Mayo Clinic–associated study found that VGCC-N antibody testing did not improve diagnostic accuracy for Lambert-Eaton myasthenic syndrome and did not predict associated small-cell lung cancer in the way some other markers may. For this reason, an elevated VGCC Type N Ab result should be reviewed by a neurologist or specialist in the context of the full clinical picture, including symptoms, other antibody markers, imaging when appropriate, and electrodiagnostic studies such as repetitive nerve stimulation or EMG.
Lab Results Explained and Tracked
What does it mean if your VOLTAGE GATED CALCIUM CHANNEL (VGCC)TYPE N AB result is too high?
An elevated or positive VGCC Type N Antibody result may suggest an autoimmune response involving nerve-related calcium channels, but it is not specific enough to confirm a neurological disorder on its own. Depending on symptoms, clinicians may consider additional evaluation for Lambert-Eaton myasthenic syndrome, autoimmune/paraneoplastic neurological syndromes, neuropathy, autonomic dysfunction, or cerebellar symptoms. Because false-positive or nonspecific results can occur, this result is usually most meaningful when it matches the patient’s symptoms and is supported by other findings.
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