Anti-Dopamine Receptor D2L (DRD2L), Titer
Optimal Result:
2000 - 8000 titer.
The Anti-Dopamine Receptor D2L (DRD2L) test measures autoantibodies directed against the D2 “long isoform” dopamine receptor, one of the most important dopamine receptors in the brain. D2L receptors are heavily involved in motor control, reward and motivation circuits, emotional regulation, executive function, and the modulation of neurotransmitter release.
When the immune system produces antibodies against D2L receptors, it may interfere with normal dopamine signaling. This process has been associated with immune-mediated neuroinflammation, particularly in children and adolescents experiencing sudden or severe neuropsychiatric symptoms. Elevated DRD2L titers have been observed in conditions such as PANS (Pediatric Acute-Onset Neuropsychiatric Syndrome), PANDAS, Sydenham chorea, and other post-infectious or autoimmune neurological disorders.
The D2L receptor is especially significant because abnormalities in D2 signaling have been linked to tics, compulsions, emotional lability, agitation, mood instability, and movement disorders. When antibodies bind to these receptors, they may disrupt dopamine’s ability to regulate neural pathways, contributing to these symptoms.
This marker is part of the Autoimmune Brain Panel™, a specialized neuro-immune test designed to assess whether autoimmune activity may be affecting neuronal structures. While DRD2L antibodies alone do not diagnose any condition, they provide important supporting evidence when evaluated alongside symptoms, infection history, other neuronal autoantibodies (DRD1, anti-tubulin, anti-lysoganglioside GM1), and CaMKII activation levels.
Lab Results Explained and Tracked
What does it mean if your Anti-Dopamine Receptor D2L (DRD2L), Titer result is too high?
An elevated Anti-Dopamine Receptor D2L (DRD2L) titer suggests the immune system is producing antibodies that may be interfering with D2L dopamine receptor function. High titers are often associated with immune-triggered neuropsychiatric symptoms, including tics, OCD behaviors, emotional swings, agitation, impulsivity, or movement abnormalities.
A high DRD2L level may signal an active or recent immune response—often following infections such as strep, mycoplasma, or other triggers. Interpretation is strongest when combined with the full Autoimmune Brain Panel™, particularly CaMKII activity and other neuronal autoantibodies.
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What does it mean if your Anti-Dopamine Receptor D2L (DRD2L), Titer result is too low?
A low or normal DRD2L titer indicates no significant autoantibody activity against the D2L dopamine receptor. This means there is no current evidence of immune targeting of this receptor. However, neuro-immune symptoms may still arise from other mechanisms, which is why the entire panel—DRD1, anti-tubulin, anti-lysoganglioside GM1, and CaMKII—is typically reviewed together.
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