Alternate Names

  • PA
  • Tryptophan-Rich Prealbumin
  • Thyroxine-Binding Prealbumin (TBPA)
  • Thyretin
  • Transthyretin

PAB is a blood component released by the liver necessary for protein use by the body, the transport and use of thyroid hormones and vitamin A, and normal fluid balance in the body. Zinc is needed for the production of PAB. Low blood levels are seen in people with burns, inflammation, poor nutrition, aspirin toxicity, or liver disease. High blood levels are seen in people with normal pregnancy, kidney disorders or disease, and Hodgkin's disease.


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