title: SERIAL PLASMA PROGESTERONE LEVELS AND ONSET OF LABOR.
mesh_terms: D001769:Blood; D002845:Chromatography; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D011247:Pregnancy; D011374:Progesterone
chemical_list: D011374:Progesterone
keywords: BLOOD; CHROMATOGRAPHY; LABOR; PREGNANCY; PROGESTERONE