title: Stability of oestrogen and oestrogen: creatinine ratio in pregnancy urine.
mesh_terms: D003404:Creatinine / Q000652:urine*; D004967:Estrogens / Q000652:urine*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011309:Preservation, Biological
chemical_list: D004967:Estrogens; D003404:Creatinine