What are the important investigations of the fauvism case? which enzyme related to

Favism used in the treatment of blood transfusion, especially in cases of severe anemia, as well as hormone (ACTH or prednisone).

The condition is characterized by abnormally low levels of glucose-6-phosphate dehydrogenase, an enzyme involved in the pentose phosphate pathway that is especially important in the red blood cell. 

Blood G6PD (Glucose-6-Phosphate Dehydrogenase Deficiency test)