Unknown Subjects Evaluated for kFLC Index and OCB Association
A study assessed the kappa free light chain (kFLC) index for detecting intrathecal immunoglobulin synthesis. A kFLC index ≥ 6.1 demonstrated 92% sensitivity and 94% specificity, while the optimal cutoff was identified as 5.1 with 95% sensitivity and 93% specificity. Results showed that 75% had a kFLC index < 3.5 that correlated with a 99.7% probability of being oligoclonal bands (OCB) negative.
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Why it matters
This research provides insights into the kFLC index's diagnostic accuracy related to OCB presence in assessing intrathecal immunoglobulin synthesis, a key factor in diagnosing multiple sclerosis.
What this does not prove
The study does not confirm the applicability of the kFLC index for clinical decision-making. Additionally, many with a kFLC index of 6.1-20 were found OCB negative, and discrepancies were noted primarily due to identifiable OCB type 4 or single band cases.
Next milestone
No next milestone was established from the available source.
Study facts
- Study design
- Not reported
- Participants / samples
- Not reported
- Randomised
- Not reported
- Controlled
- Not reported
- Primary endpoint met
- Not reported
- Relevant MS type
- Not reported
- Publication date
- 2026-08-13
- Evidence reviewed
- Abstract only
- Regulatory approval
- Not reported
- Research areas
- Not classified
Original sources
- Primary evidenceComparing kappa free light chain index and CSF-restricted oligoclonal bands for detecting intrathecal immunoglobulin synthesis in a Norwegian cohort. ↗DOI: 10.1016/j.msard.2026.107447
Supporting passages (4)
peer reviewedJournal: Multiple sclerosis and related disorders
findingsA kFLC index ≥ 6.1 yielded 92% sensitivity and 94% specificity, with positive and negative predictive values of 70% and 99%.
publication datePublication date: 2026-08-13
limitationsTitle: Comparing kappa free light chain index and CSF-restricted oligoclonal bands for detecting intrathecal immunoglobulin synthesis in a Norwegian cohort.
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