1) The anorganic phosphorus in the serum of every type of leprosy and erythema nodosum leprosum presents the normal level.
2) The calcium range is normal in every type of leprosy, but the decrease of it is observed in the serum with erythema nodosum leprosum.
3) The alkaline phosphatase increases somewhat in lepromatous leprosy than in maculous or nervous leprosy, bnt shows the normal level in every type. In erythema nodosum leprosum the increase is more remarkable than in leprous leprosy.