Related Experiment Video

Updated: Jan 21, 2026

Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation
06:59

Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation

Published on: February 29, 2020

8.8K

Diagnostic relevance of free light chains in cerebrospinal fluid - The hyperbolic reference range for reliable data

Hansotto Reiber1, David Zeman2, Pavlína Kušnierová3

  • 1CSF and Complexity Studies, Göttingen, Germany.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|July 29, 2019
PubMed

Insights

A new hyperbolic reference range for cerebrospinal fluid free light chains, type kappa (FLC-K), improves detection of brain immune reactions. This method offers superior accuracy over linear and exponential models for diagnosing conditions like Multiple Sclerosis.

Area of Science:

  • Neurology
  • Immunology
  • Biochemistry

Background:

  • Cerebrospinal fluid (CSF) free light chains, type kappa (FLC-K), are investigated for detecting brain immune responses.
  • Current interpretation of CSF data lacks consensus, hindering reliable diagnostic conclusions.
  • A theory-based hyperbolic reference range in CSF/serum quotient diagrams is proposed to overcome these limitations.

Purpose of the Study:

  • To establish a theory-based hyperbolic reference range for CSF FLC-K analysis.
  • To compare the diagnostic accuracy of the hyperbolic reference range with existing methods for immune reactions in the brain.
  • To evaluate the utility of CSF FLC-K in differentiating neurological conditions.

Main Methods:

  • Mean quotients for FLC-K (QKappa) and albumin (QAlb) from controls (N=433) were fitted using a hyperbolic function.
  • A generally applicable procedure excluded outliers to establish the reference range.
  • The derived hyperbolic reference range was applied to analyze FLC-K in control and Multiple Sclerosis (MS) patient groups.

Main Results:

  • A discrimination line for intrathecal FLC-K (QKappa(lim)) was established using the hyperbolic reference range.
  • Intrathecal FLC-K was detected in 8% of controls without oligoclonal bands (OCB).
  • In definite MS patients (N=95), 7% of intrathecal FLC-K was missed by the new method, while the mean intrathecal fraction of FLC-K (95%) was significantly higher than total IgG (36%).

Conclusions:

  • The hyperbolic reference range demonstrates superior performance compared to linear and exponential models for CSF FLC-K analysis in MS.
  • This method reduces false negatives and false positives, enhancing diagnostic accuracy.
  • The study highlights the dynamics of FLC-K in understanding molecular size-dependent barrier functions in neurological diseases.
Abstract

Keywords:
CISCerebrospinal fluidClinically isolated syndromeFree light chain kappaGrouped data statisticsHyperbolic functionMultiple sclerosisReference range

More Related Videos

Sample Preparation for Endopeptidomic Analysis in Human Cerebrospinal Fluid10:23

Sample Preparation for Endopeptidomic Analysis in Human Cerebrospinal Fluid

Published on: December 4, 2017

9.4K
Novel Diagnostics in Revision Arthroplasty: Implant Sonication and Multiplex Polymerase Chain Reaction10:35

Novel Diagnostics in Revision Arthroplasty: Implant Sonication and Multiplex Polymerase Chain Reaction

Published on: December 3, 2017

11.5K

Related Concept Videos

Cerebrospinal Fluid01:21

Cerebrospinal Fluid

Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
CSF Production
CSF is produced mainly in the choroid plexus, a network of capillaries and ependymal cells located within the ventricular system of the brain....
5.5K
Reaction Quotient02:35

Reaction Quotient

The status of a reversible reaction is conveniently assessed by evaluating its reaction quotient (Q). For a reversible reaction described by m A + n B ⇌ x C + y D, the reaction quotient is derived directly from the stoichiometry of the balanced equation as
52.8K
Range Rule of Thumb to Interpret Standard Deviation01:13

Range Rule of Thumb to Interpret Standard Deviation

The range rule of thumb in statistics helps us calculate a dataset's minimum and maximum values with known standard deviation. This rule is based on the concept that 95% of all values in a dataset lie within two standard deviations from the mean.
For instance, the range rule of thumb can be used to find the tallest and the shortest student in a class, given the mean student height and standard deviation. If the mean student height is 1.6 m and the standard deviation, s is 0.05 m, the height...
13.4K
Bioequivalence Data: Statistical Interpretation01:16

Bioequivalence Data: Statistical Interpretation

Body:The statistical interpretation of bioequivalence data is a significant aspect of pharmaceutical research. Bioequivalence refers to the absence of any significant difference in the rate and extent to which the active ingredient in pharmaceutical products becomes available at the site of drug action when administered at the same molar dose under similar conditions. This helps determine if different drug products have similar absorption rates, ensuring their interchangeability.Statistical...
196
Phase Diagrams02:39

Phase Diagrams

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
49.0K
The Quotient Rule01:30

The Quotient Rule

The quotient rule is a fundamental differentiation technique in calculus used to differentiate functions expressed as a ratio of two differentiable functions. Given a function of the form:Where g(x) and h(x) are both differentiable and h(x) ≠ 0, the derivative of f(x) is given by:Example:The quotient rule is beneficial when differentiating rational functions, trigonometric ratios, and exponential functions. For example, given:applying the quotient rule,This rule is essential in solving...
43