1.0 mL serum in red top or serum separator AND 1.0 mL CSF in non‑additive tube (label BOTH 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 CSF albumin to eliminate the effect of blood crossing into the CNS vs intrathecal antibody production.
Note: Both serum AND CSF MUST be submitted together.