I am writing my bachelor thesis about alternative materials for feminine hygiene products and for testing I need to know what the viscosity is of menstruation blood. Can I use water as replacement for menstruation blood because this kind of blood exists out of a big part of water? And what is the composition of menstruation blood in percentages?

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    $\begingroup$ H. Larsson et al., Studies on blood viscosity during the menstrual cycle and in the postmenopausal period in healthy women, Acta Obstet.Gynecol. Scand., 1989, 68, 483-486 might be interesting to get a hand on. From the abstract, it seems that for plasma viscosity increases up to day 21 of the menstruation cycle. $\endgroup$ Mar 24, 2015 at 13:34
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    $\begingroup$ I wonder if menstrual blood viscosity correlates well with circulatory blood viscosity, since the former has to do with shed tissue from the uterine walls rather than blood exposed from a cut. $\endgroup$ Mar 24, 2015 at 15:31

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It is difficult to give a typical value as the composition and hence the physical properties of menstrual blood varies over the course of a woman's period. This reference has a good discussion which you may find useful; you can find on p. 159:

It is fair to say that a large proportion of menses samples are considerably more viscous than blood or water - about four times as viscous as venous blood and 35 times as viscous as water.


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