No abstract available
MeSH terms
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Adolescent
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Adult
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Chorionic Gonadotropin / blood*
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Down Syndrome / diagnosis*
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Estradiol / blood*
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False Positive Reactions
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Female
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Humans
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Maternal Age
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Middle Aged
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Pregnancy
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Pregnancy Trimester, First
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Prenatal Diagnosis / methods*
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alpha-Fetoproteins / analysis*
Substances
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Chorionic Gonadotropin
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alpha-Fetoproteins
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Estradiol