Amylase to CrCl Ratio 

Input:
Urine_Amyl
Plas._Creat
Plas._Amyl
Urine_Creat

Result:

FEAmy
Decimal 

A fractional excretion of amylase > 5% may mean acute pancreatitis while an excretion less than 1% may mean macroamylasemia