Plasma proteins
Blood blasma contains a large number of dissolved proteins, carrying out a number of different functions. The most common plasma protein is called albumin, and its main function is to transport other substances, particularly waste products and foreign substances (incl. drugs and some contrast media) to the liver (for destruction) and/or to the kidneys (for elimination into the urine). For contrast media a high degree of binding to plasma proteins, and albumin in particular, is seen as a sign of (chemo-)toxicity, i.e. the higher the degree of protein binding, the more likely a substance may cause adverse reactions.
GE Healthcare Glossary