title: Estimation of gestational age and maternal serum steroid concentrations. Unconjugated estriol.
mesh_terms: D004964:Estriol / Q000097:blood*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011863:Radioimmunoassay; D013997:Time Factors
chemical_list: D004964:Estriol