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Combined Liquid Chromatography–Tandem Mass Spectrometry Analysis of Progesterone Metabolites

Fig 4

Representative calibration curves in solvent.

A) (20S)-pregn-4-ene-3α,20-diol (r = 0.9999, y = 0.00015x). B) (20S)-5α-pregnane-3α,20-diol (r = 0.9998, y = 0.00014). Curves are constructed out of three measurements for each concentration.

Fig 4

doi: https://doi.org/10.1371/journal.pone.0117984.g004