title: Use of small samples of urine to follow ovarian and placental changes in progesterone secretion.
mesh_terms: D002849:Chromatography, Gas; D003404:Creatinine / Q000652:urine; D005260:Female; D006801:Humans; D010053:Ovary / Q000502:physiology*; D010060:Ovulation; D010920:Placenta / Q000502:physiology*; D011247:Pregnancy; D011276:Pregnanediol / Q000652:urine*; D011374:Progesterone / Q000378:metabolism*; D013997:Time Factors
chemical_list: D011374:Progesterone; D003404:Creatinine; D011276:Pregnanediol