Voltage Gated Calcium Channel Antibodies – Referral
Code:
VGCC
Sample Type:
2mL Serum (Gel 5mLYellow tube)
Ref Ranges/Units:
pM
<45pM is negative. >45pM is positive
Turnaround:
3-4 weeks
Frequency of Analysis: Referred to Oxford University Hospital, sent every day except Friday
Special Precautions/Comments:
Method: Sent away to: Oxford University Hospital
Interferences: None known.
Additional Information:
Indication: Lambert-Eaton myasthenic syndrome (LEMS).
Background Information: Voltage-gated calcium channel antibodies in small-cell lung carcinomas may initiate autoimmunity in the paraneoplastic neuromuscular disorder Lambert–Eaton myasthenic syndrome (LEMS). It has been found that the P/Q-type of voltage-gated calcium channel is expressed by some small-cell lung carcinomas. When antibodies are directed towards voltage-gated calcium channels, the muscle weakness associated with LEMS is observed [1,2]. VGCC antibodies should be looked for in paraneoplastic cerebellar degeneration (PCD) associated with small cell lung carcinomas, even if there are no symptoms of LEMS as other paraneoplastic neurological conditions, such as cerebellar ataxia, have been found to have positive calcium channel antibodies [2].
References: Wirtz PW, et al. P/Q-type calcium channel antibodies, Lambe Eaton Myasthenic syndrome and survival in small cell lung carcinoma. Journal of Neuroimmunology. 2005. 164; 161-165. [Ref 1] Lennon VA, et al. Calcium-channel antibodies in the Lambert Eaton syndrome and other paraneoplastic syndromes. The New England Journal of Medicine. 1995. 332; 1467–1474. [Ref 2]
See Also: Voltage-gated potassium channel antibodies
Telephone Gateshead Lab: 0191.4456499 Option 4, Option 1