1. Validation of a rapid alkaline hematin technique to measure menstrual blood loss on feminine towels containing superabsorbent polymers 
Julia L. Magnay, M.Sc., Gerrit Schönicke, M.D., Tracy M. Nevatte, Ph.D., Shaughn O’Brien, D.Sc., Wolfgang Junge, M.D. 
Fertility and Sterility 
Volume 96, Issue 2, Pages (August 2011)
DOI: /j.fertnstert
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Calibration master curves for the measurement of hemoglobin (as alkaline hematin) extracted from Always Ultra normal, long, and night towels. The dashed lines represent the absorbance of hemoglobin diluted in NaOH but not applied to towels.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
Linear regression analysis of blood recovered from known volumes and percent compositions of simulated menstrual fluid (SMF) applied to Always Ultra normal, long, and night towels. Volumes tested contained 0.05 to 35 mL and 5% to 100% whole blood; n = 63 towels (21 of each type). Composite data from all towel types are shown.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions

4. Figure 3
Bland-Altman analysis of mean blood recovered by the manual reference method and the semiautomated method versus the difference in recovery between the methods. The horizontal dotted lines denote the 95% limits of agreement; n = 63 towels (21 of each type). Composite data from all towel types are shown.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions