Tag: Blood test timing

According to the National Institutes of Health, the amount of iron in your blood can vary throughout the day. So, do iron levels fluctuate daily? Yes, they do, largely influenced by your body's internal clock, or circadian rhythm, and other factors, making the time of day a critical consideration for blood tests.

According to a study published on bioRxiv, serum iron levels are regulated by the body's endogenous circadian clock, with concentrations typically higher during the day and lower at night. This established scientific fact directly answers the question, **does iron fluctuate daily?**, and highlights why the timing of blood tests is so crucial.