No abstract available
MeSH terms
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Chorionic Gonadotropin, beta Subunit, Human / blood
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Cost-Benefit Analysis
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Down Syndrome / blood
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Down Syndrome / diagnosis
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False Positive Reactions
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Female
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Health Care Costs
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Humans
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Maternal Serum Screening Tests / economics
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Maternal Serum Screening Tests / methods*
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Maternal Serum Screening Tests / standards
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Pregnancy
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Pregnancy Trimester, First / blood*
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Pregnancy-Associated Plasma Protein-A / metabolism
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Prenatal Care / methods*
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Prenatal Diagnosis / economics
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Prenatal Diagnosis / methods*
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Prenatal Diagnosis / standards
Substances
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Chorionic Gonadotropin, beta Subunit, Human
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Pregnancy-Associated Plasma Protein-A
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PAPPA protein, human