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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Mar 12;1084:106–112. doi: 10.1016/j.jchromb.2018.03.023

Figure 3.

Figure 3

Figure 3

Chromatogram of A) levonorgestrel and B) D-(−)-norgestrel-d7 from a study participant with a levonorgestrel plasma concentration of 821 pg/mL)