macroamylase

Descriptive term applied to a form of serum amylase in which the enzyme is present as a complex joined to a globulin; the molecular weight of the enzyme alone is 50,000, whereas that of the complex probably exceeds 160,000; hence, renal excretion of the complex is not appreciable.

* * *

mac·ro·am·y·lase (mac″ro-amґə-lās) serum amylase bound to a globulin. Because the complex formed (MW 200,000) is too large for renal clearance, its formation results in elevated levels of plasma amylase.