Accurate assessment of early gestational age by measuring serum hCG and  SP1.
D006063:Chorionic Gonadotropin / Q000097:blood*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011257:Pregnancy Proteins / Q000097:blood*; D011261:Pregnancy Trimester, First
D006063:Chorionic Gonadotropin; D011257:Pregnancy Proteins