What are some common methods of enzyme measurement in clinical chemistry?

• A. Magnetic resonance imaging and urinalysis
• B. Western blotting and PCR
• C. Spectrophotometry and immunoassays
• D. Fluorescence microscopy and chromatographic methods

Answer: (C)

Enzyme measurement in clinical chemistry is primarily focused on quantifying enzyme activity or concentration in biological samples for diagnostic purposes. Spectrophotometry and immunoassays are widely used techniques for this.

Spectrophotometry measures the absorbance of light by a sample, which can be correlated to enzyme concentration. In clinical settings, this method is frequently employed for enzymes, as it allows for straightforward and rapid quantification based on the specific wavelengths absorbed by the reaction products formed when enzymes catalyze their substrates.

Immunoassays utilize antibodies specific to the enzyme being measured, providing a highly sensitive method to detect and quantify enzyme levels. This technique can be highly specific, making it particularly advantageous for diagnosing certain conditions based on enzyme levels.

In summary, the combination of spectrophotometry's ability to quantitate enzyme activity through absorbance changes and the specificity and sensitivity of immunoassays makes them prevalent and reliable methods for enzyme measurement in clinical chemistry.