This is really good overview on Autoimmune Encephalities. My son was checked for the NR 1 receptor for NMDAR encephalities in November but it came back negative. However, I still think my son has a form of encephalities because of his high glutemate levels. So I am going to see if our doctor will check for GABA receptors that affect the levels of glutamate. There is lots of information in this article. This doctor talks about different things that can cause encephalities.
http://www.ssi.dk/~/media/Indhold/DK%20-%20dansk/Diagnostik/DiagnostiskHaandbog/Autoimmune%20encephalitis%2044.ashx