Sorry if this is a repeat thread but I had a quick look first.
It's the first time anyone's done an assessment of period products absorbency using blood and not just saline. Doctors have been using fuck all data to assess whether a woman has a "heavy flow" up until now.
https://srh.bmj.com/content/early/2023/07/03/bmjsrh-2023-201895
"Understanding the capacity of different products could help doctors to estimate whether a person is in need of further tests or treatments, as excessive menstrual bleeding could put them at risk of anaemia, or be suggestive of other underlying medical problems.“I might ask a patient, ‘what’s your period like?’ and she might say, ‘well, I soak a pad about every two hours’ – but I don’t necessarily have the time to ask what brand it is or if it’s super maxi,”
https://www.theguardian.com/society/2023/aug/08/menstrual-discs-may-be-better-for-heavy-periods-than-pads-or-tampons-study
(Apologies for the term menstruators in that article 
)