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Carefully measured blood loss averages about 30 to 40 mL per cycle, which is roughly 2 to 3 tablespoons. It looks like far more because it mixes with mucus and shed tissue and spreads across products. Losing more than 80 mL per cycle is the medical threshold for heavy bleeding and is worth investigating.
Hallberg L et al. Menstrual blood loss: a population study. Acta Obstetricia et Gynecologica Scandinavica, 1966. (The classic direct-measurement study.)
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