A simple immunoturbidimetric method for IgG and albumin quantitation in cerebrospinal fluid and serum

Area of Science:

• Clinical Chemistry
• Immunology
• Diagnostic Assays

Background:

• Cerebrospinal fluid (CSF) analysis is vital for diagnosing neurological disorders.
• Accurate quantification of proteins like immunoglobulin G (IgG) and albumin in CSF and serum is essential for calculating diagnostic indices.
• Existing methods may lack simplicity, versatility, or broad measurement ranges.

Purpose of the Study:

• To develop and validate a simple immunoturbidimetric method for measuring IgG and albumin in both CSF and serum.
• To enable the calculation of CSF indices using a single assay protocol.
• To assess the method's sensitivity, precision, and correlation with established techniques.

Main Methods:

• Immunoturbidimetric assay development.
• Single calibration curve application for both CSF and serum samples for each protein.
• Validation through precision studies (CVs) and comparison with radial immunodiffusion and rate nephelometry.

Main Results:

• The method demonstrated high sensitivity and a wide measurement range for both IgG (0.007–94 g/l) and albumin (0.06–92.40 g/l).
• Excellent precision was achieved with overall coefficients of variation (CVs) ≤ 4.9% for IgG and ≤ 1.3% for albumin.
• High correlation coefficients (r ≥ 0.967) were observed when compared to radial immunodiffusion and rate nephelometry.

Conclusions:

• The described immunoturbidimetric method is reliable, simple, and versatile for measuring IgG and albumin in CSF and serum.
• The assay is suitable for routine laboratory work, facilitating the calculation of CSF indices.
• This method offers a robust alternative for protein quantification in clinical diagnostics.