It has recently been proposed that the true upper normal limit of serum alanine aminotransferase (ALT) is much lower than that listed by the manufacturers of commercially available assays.

ALT and AST are measured in international units per liter (U/L). The normal range of values (meaning the values between which levels are normal) are: ALT: Between 4 and 36 U/L AST: Between 8 and ...

Bullish option flow detected in Altimmune (ALT) with 3,346 calls trading, 1.9x expected, and implied vol increasing almost 3 points to 105.75%.