Which method can be used for the measurement of serum proteins aside from nephelometry?

• A. Turbidimetry
• B. Electrophoresis
• C. Chromatography
• D. Mass spectrometry

Answer: (A)

Turbidimetry is a valid method for measuring serum proteins and operates on the principle of light scattering. In turbidimetry, a light source emits light that passes through a sample containing proteins. When proteins are present in the solution, they scatter the light, and the amount of scattered light can be quantified. The intensity of the scattering correlates with the concentration of proteins in the serum, providing a means to measure serum protein levels.

While other methods mentioned, such as electrophoresis, chromatography, and mass spectrometry, are also used to analyze proteins, they work on different principles and are generally employed for distinct purposes. Electrophoresis separates proteins based on their size and charge, chromatography separates based on varying affinities for a stationary phase, and mass spectrometry identifies and quantifies proteins based on their mass. Each of these methods has its specific applications in clinical chemistry, but turbidimetry is particularly suited for direct quantification of protein concentrations in a similar way to nephelometry, making it a suitable alternative.