The plasma protein that demonstrates a decreased serum concentration during an intravascular hemolytic disorder and is used to identify this occurrence is:

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Haptoglobin is a plasma protein that binds to free hemoglobin, helping to clear it from the bloodstream. During intravascular hemolysis, there is an increased release of hemoglobin into the bloodstream, leading to decreased serum haptoglobin levels. Therefore, a decrease in haptoglobin concentration is used to identify this occurrence. The other choices do not show a specific correlation with intravascular hemolytic disorders.

The Plasma Protein That Demonstrates a Decreased Serum Concentration During