1.0 mL serum in red top, white top, or serum separator tube AND 1.0 mL CSF in red top tube. Label samples accordingly.
Test Description
This test is used to identify intrathecal production of antibody as an indication of active disease within the CNS. The specific antibody index is performed by utilizing a ratio of serum and Cerebrospinal Fluid (CSF) albumin to eliminate the effect of blood crossing into the CNS vs intrathecal antibody production.