<s>[INST] My son has been feeling tired for a couple of weeks. I took him to the doctor because he had not been in about 3 years (he s 19). He is 6 ft and about 165 pounds. He has also been taking a mass gainer and another supplement with creatine. They did a complete blood panel on him. The doctors office called today and said his liver function was high.....ALT 107 and his AST 61. what does this mean? Could it be from the Creatine? [/INST] Hi...just elevated liver enzymes of this level of what you quote without any other associated symptoms cannot be correlated with the liver enzymes alone. Elevation of liver enzymes is of very non-specific value and does not mean anything unless it is being corroborated with other disease evidence which you query doesn't mention anything about. As of now if I were you treating pediatrician I suggest - you need not worry about this liver enzyme. Regards -  </s>