blood globulin level blood haptoglobin level 2014-08-04T16:07:34Z CMO:0002519 EFO:0004640 JSmith Measurement of the amount of haptoglobin in a specified sample of blood. Haptoglobin is a serum alpha2 globulin glycoprotein, produced by the liver, that functions to bind free plasma hemoglobin, which allows degradative enzymes to gain access to the hemoglobin, while at the same time preventing loss of iron through the kidneys and protecting the kidneys from damage by hemoglobin. clinical_measurement_ontology haptoglobin measurement