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When something begins to go wrong with the liver, there can be big problems. That's why liver function tests can be critical--and even life-saving. But many patients become confused over the variety of liver function tests, which often include unfamiliar medical terms such as AST, ALT, SAP, 5-Nucleotidase and GGT.  This article has been written to help simplify liver function tests for anyone who may be facing them.