In clinical chemistry, a spectrophotometer measures analytes by detecting what property?

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Multiple Choice

In clinical chemistry, a spectrophotometer measures analytes by detecting what property?

Spectrophotometry measures how much light a sample absorbs at a specific wavelength. When an analyte is involved in a color-forming reaction, the sample’s color intensity—and thus its light absorption—increases with concentration. The instrument passes light through the sample and watches how much is transmitted; the absorbance value, linked to concentration via Beer-Lambert law, lets us quantify the amount of analyte present. This approach is different from measuring mass-to-charge ratio (used in mass spectrometry), detecting emitted fluorescence (fluorometry), or assessing electrical potential (electrochemical methods). So the key signal a spectrophotometer detects is the absorbance of light.

Spectrophotometry measures how much light a sample absorbs at a specific wavelength. When an analyte is involved in a color-forming reaction, the sample’s color intensity—and thus its light absorption—increases with concentration. The instrument passes light through the sample and watches how much is transmitted; the absorbance value, linked to concentration via Beer-Lambert law, lets us quantify the amount of analyte present. This approach is different from measuring mass-to-charge ratio (used in mass spectrometry), detecting emitted fluorescence (fluorometry), or assessing electrical potential (electrochemical methods). So the key signal a spectrophotometer detects is the absorbance of light.

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