Haptoglobin

Haptoglobin is a protein that binds to hemoglobin when it is not contained within a red blood cell. It therefore prevents the hemoglobin from exchanging oxygen and targets it for delivery to the spleen for disposal. It is routinely tested for when anemia is suspected as the haptoglobin levels can pinpoint a diagnosis.
Haptoglobin at Wikipedia
Category:Biology
Category:Blood chemistry