Determination of Ethinyl Estradiol and Levonorgestrel in Human Plasma with Prednisone as Internal Standard Using Ultra-performance Liquid Chromatography-Tandem Mass Spectrometry

以泼尼松为内标超高效液相色谱-串联质谱法测定人血浆中的炔雌醇和左炔诺孕酮