The sTfR is a protein dimer that results from proteolytic cleavage of the extracellular transferrin receptor on cell surfaces. The serum concentration is directly proportional to the erythropoietic rate and inversely proportional to tissue iron availability [27]. The normal range of sTfR is 0.8–2.2 ...
ferritin, and percent transferrin saturation are usually lower in samples collected from females during the luteal phase of the cycle. [3] In other words, your iron status can be lower if you do a blood test during a period.
(Waypa et al., 2010). More recently, it has been shown that several cellular types respond to acute hypoxia with a transient increase in superoxide production that quickly runs out (minutes) and that can be sufficient to be translated into oxidative signals contributing to hypoxic adaptation (...