Serum alanine aminotransferase (ALT)
damage releases the enzyme ALT and high concentrations are therefore indicative of
active liver cell damage - whatever the primary cause. It is not a test that measures liver function,
as only a small area of liver may be damaged to get significant increases in ALT
- usually within 4-5 days. Even very high ALT concentrations can be followed by complete recovery
by the liver.
Myocarditis can also result in an increase in ALT, but
this is uncommon.