CIS-4	Cooled Injection System 4
DP	Drospirenone
DP/20EE	A formulation of 0.02 mg of EE and 3 mg of DP per tablet
DP/30EE	A formulation of 0.03 mg of EE and 3 mg of DP per tablet
EPA	Environmental Protection Agency
ES	Estrone
EE	17α-ethinyl estradiol
FD	Fluorescence detector
GC–MS	Gas Chromatography–Mass Spectrometry
i.d.	Inner Diameter
IS	Internal standard
LC–MS	Liquid Chromatography–Mass Spectrometry
LOD	Limit of Detection
LOQ	Limit of Quantification
MPS2	Multi-Purpose Sampler 2
MS	Mass Spectrometry
NIH	National Institutes of Health
NIST	National Institute of Standards and Technology
RSD	Relative Standard Deviation
SIM	Selected Ion Monitoring
UV	Ultraviolet