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Test Compendium


Test Code

  • 2479

Test Synonym

  • IgG Synthesis Rate, CNS Index

Minimum Volume

  • 0.75 mL

Specimen Requirements

  • CSF and Serum


  • CSF And Serum, Serum Separator Tube, Plain Red Top Tube, Sterile Container, Transfer Tube


  • Ambient

Turn Around Time

  • 5 days

CPT Codes

  • 82040,82042,82784
    *The CPT codes provided are based on AMA guidelines and are provided for informational purposes only. CPT coding is the responsibility of the billing entity. Please direct any questions regarding the CPT coding to the payer being billed.

Special Instructions

  • 1.5 mL serum AND 1 mL CSF

Additional Information

  • Serum AND Cerebrospinal fluid (CSF) Collect for serum Red-top tube or SST (gel-barrier tube) For the CSF - Spinal tab, transfer CSF to a plastic sterile tube This test requires both a CSF and a Serum sample

Specimen Stability

  • Stability :CSF & Serum - AMB 14 days, REF 14 days, Frozen 14 days