https://www.waters.com/nextgen/ch/de/library/application-notes/2012/challenges-in-developing-an-ultra-sensitive-bioanalytical-method-for-ethinylestradiol-in-human-plasma.html
In this study, sensitive and selective methods for ethinylestradiol in human plasma were developed and partially validated.
ultra sensitivechallengesdevelopingbioanalyticalmethod