title: Correlation between first morning sample and twenty four hours urinary estrogen/creatinine ratio.
mesh_terms: D002940:Circadian Rhythm; D003404:Creatinine / Q000652:urine*; D004967:Estrogens / Q000652:urine*; D005260:Female; D006801:Humans; D011247:Pregnancy; D012016:Reference Values
chemical_list: D004967:Estrogens; D003404:Creatinine