After the administration of ferrum reductum, serum iron level was elevated and reached maximam value in 4 hours. Then gradual decrease was seen, and coming back to the pretest level and thereafter no rising trend was seen for 32 hours.
To comfirm the ferrum reductum administration would always cause the rise of serum iron level, ferrum reductum was given during night, and the rise was recognized, indicating that ferrum reductum was practically absorbed.