Unexpectedly low values for pregnancy-specific beta 1-glycoprotein (SP1): a possible explanation.
D005188:False Negative Reactions; D005260:Female; D006801:Humans; D011247:Pregnancy; D011257:Pregnancy Proteins / Q000032:analysis*; D011268:Pregnancy-Specific beta 1-Glycoproteins / Q000032:analysis*
D011257:Pregnancy Proteins; D011268:Pregnancy-Specific beta 1-Glycoproteins