An occult blood test yields a positive result indicated by color change to which color?

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Multiple Choice

An occult blood test yields a positive result indicated by color change to which color?

Explanation:
An occult blood test detects the peroxidase activity of hemoglobin. In a guaiac-based test, the guaiac substrate reacts with hydrogen peroxide in the presence of hemoglobin to produce a blue color. This blue color indicates a positive result, meaning occult blood is present. Other colors do not reflect this reaction, so they do not indicate a positive test. Diet and medications can affect results, potentially causing false positives or negatives.

An occult blood test detects the peroxidase activity of hemoglobin. In a guaiac-based test, the guaiac substrate reacts with hydrogen peroxide in the presence of hemoglobin to produce a blue color. This blue color indicates a positive result, meaning occult blood is present. Other colors do not reflect this reaction, so they do not indicate a positive test. Diet and medications can affect results, potentially causing false positives or negatives.

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