Alanine aminotransferase (ALT) is also known as serum glutamic pyruvic transaminase (SGPT) ALT is what is elevated in the blood when the liver is injured. Interferons have been linked to liver damage and high enzymes.
The normal range of values for ALT (SGPT) is from 7 to 56 units per liter of serum. Yeah, 171 is considered high for ALT.
My husband had an ALT level of 190 and AST of 200 when he was dx with MS, even before meds. We got his enzymes down with a milk thistle supplement, and his numbers are fine now. He's on copaxone, which doesn't effect the liver
Here's some more info:
http://www.medicinenet.com/liver_blood_ ... rticle.htm
wishing you best,