It is recommended to use the test on serum. It has not been reported cases of only CSF positive.
References
Read "Updated Diagnostic Criteria for Paraneoplastic Neurologic Syndromes" (open access)
Rekommendationen är att endast testa i serum. Det har inte rapporterats fall som endast har varit positiv i CSF.
Referenser
Läs "Updated Diagnostic Criteria for Paraneoplastic Neurologic Syndromes" (open access)