1. Menstrual blood loss measurement: validation of the alkaline hematin technique for feminine hygiene products containing superabsorbent polymers 
Julia L. Magnay, M.Sc., Tracy M. Nevatte, Ph.D., Vandana Dhingra, M.B.B.S., Shaughn O'Brien, D.Sc. 
Fertility and Sterility 
Volume 94, Issue 7, Pages (December 2010)
DOI: /j.fertnstert
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Linear regression analysis of mean blood recovered from known volumes of 50% SMF applied to Always Ultra Normal, Long, and Night towels. Error bars depict SEM. The “true” value (100% recovery) is shown by the dotted line; n = 10 experiments.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
Linear regression analysis of blood recovered from known volumes of 50% SMF applied to Always Ultra Normal, Long, and Night towels. Volumes tested were 0.5–25 mL; n = 135 towels. Composite data from all towel types are shown.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions