Abstract
Serum Fe detns. were made in 206 nor mal subjects (108 male + 98 female) between the ages of 10 and 80 yrs. Avg. values for males were higher than those for females at all ages. Avg. values for males increased from 97 [mu]g./100 cc. at age 10-15 yrs. to a max. of 132 [mu]g./100 cc. at age 21-30 and then fell progressively to 75 [mu]g./100 cc. at age 71-80. Corresponding values for females were 92, 116, and 66 [mu]g./100 cc.