Nephelometry measures the light?
**Core Concept**
Nephelometry is a technique used to measure the concentration of particles in a solution by detecting the light scattered by those particles. This method relies on the principle of light scattering, where the intensity of the scattered light is directly proportional to the concentration of particles in the solution.
**Why the Correct Answer is Right**
The correct answer is related to the principle of light scattering, where the intensity of the scattered light is measured. In nephelometry, a beam of light is passed through the solution, and the intensity of the scattered light is detected at a specific angle. This scattered light is then measured using a photodetector, which provides a direct measure of the concentration of particles in the solution. The scattered light is typically measured at a 90-degree angle to the incident light beam.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because nephelometry measures the light scattered by particles, not the light absorbed or transmitted through the solution.
**Option B:** This option is incorrect because nephelometry is a technique used to measure particle concentration, not the pH of a solution.
**Option C:** This option is incorrect because nephelometry does not measure the light emitted by particles, but rather the light scattered by them.
**Clinical Pearl / High-Yield Fact**
Nephelometry is a widely used technique in clinical laboratories to measure the concentration of various analytes, including proteins, antibodies, and other particles. It is particularly useful for measuring the concentration of proteins in serum, such as albumin and globulins.
**Correct Answer:** C.