Anti-N-methyl-D-Aspartate Receptor (NMDAR), Serum

Serum

2 mL

1 mL (Note: This volume does not allow for repeat testing.)

Serum from a gel-barrier tube, serum from a red-top tube, gel-barrier tube, serum transfer tube

NMDAR1 is a glutamate receptor and ion channel found in neurons. This receptor is thought to be very important for controlling synaptic plasticity and mediating learning and memory functions. Antibodies against NMDAR1 generate both neurologic and psychiatric symptoms. Common symptoms include personality change, psychosis, abnormal movements, seizures and autonomic dysfunction. Anti-NMDA receptor IgG antibody is found in a subset of patients with autoimmune limbic encephalitis and may occur with or without associated tumor. Decreasing antibody levels may be associated with therapeutic response; therefore, clinical correlation must be strongly considered. A negative test result does not rule out a diagnosis of autoimmune limbic encephalitis.

Results should not be used as a diagnostic procedure without confirmation by another medically established diagnostic product or procedure.

This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.

Immunofluorescence (IFA)

Anti-NMDAR1 encephalitis represents one of the most frequent causes of autoimmune encephalitis. This type of encephalitis may also be associated with post-COVID-19 related neurological symptoms.