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Haptoglobin

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Haptoglobin is an alpha-2-globulin.

The function of haptoglobin is to bind free haemoglobin in the blood, with a capacity of up to 1.4 grams per litre. The haptoglobin-haemoglobin complexes are removed by the reticuloendothelial system, resulting in a reduction in the concentration of haptoglobin.

It is only when the binding capacity is rapidly exceeded - in acute haemolysis - that haemoglobin appears in urine.

Haptoglobin is an acute phase protein, rising in concentration during acute inflammation.

Reference

  1. Anderson C et al. Haptoglobin. Antioxid Redox Signal. 2017 May 10;26(14):814-831

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