What is the main reason females have lower RBC counts?

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What is the main reason females have lower RBC counts?

Sex hormones shape how actively the bone marrow makes red blood cells. Estrogen tends to dampen the erythropoietic process, so the marrow’s response to erythropoietin is reduced in females. This hormonal effect contributes to the lower RBC counts observed in women compared with men, who have higher testosterone that stimulates erythropoiesis. While iron loss from menstruation can lead to anemia, the mechanism best explaining the general sex difference in RBC production is estrogen’s indirect inhibition of erythropoiesis. The other factors—iron deficiency as a consequence, higher RBC destruction, or inherently weaker bone marrow—don’t account for the typical baseline difference as directly.

Sex hormones shape how actively the bone marrow makes red blood cells. Estrogen tends to dampen the erythropoietic process, so the marrow’s response to erythropoietin is reduced in females. This hormonal effect contributes to the lower RBC counts observed in women compared with men, who have higher testosterone that stimulates erythropoiesis. While iron loss from menstruation can lead to anemia, the mechanism best explaining the general sex difference in RBC production is estrogen’s indirect inhibition of erythropoiesis. The other factors—iron deficiency as a consequence, higher RBC destruction, or inherently weaker bone marrow—don’t account for the typical baseline difference as directly.

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