Diurnal Variation in the Plasma Iron Level of Man.

Abstract
The diurnal variation in plasma Fe was studied in 19 adult males without demonstrable organic disease. The mean plasma Fe level at 9:00 a.m. was 155 [plus or minus] 16 [mu]g. % and at 5:00 p.m. was 65 [plus or minus] mug. %. Thus the plasma Fe decreased during the day and rose during the night.