AST http://www.nlm.nih.gov/medlineplus/ency/article/003472.htm AST AST http://www.nlm.nih.gov/medlineplus/ency/article/003472.htm AST AST: MedlinePlus Medical Encyclopedia serum aminotransferases nlm.nih.gov AST nlm.nih.gov nlm.nih.gov AST (MedlinePlus Health Information: Encyclopedia (NLM/NIH)) AST: MedlinePlus Medical MedLinePlus