No abstract available
MeSH terms
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Chromosome Disorders / diagnosis
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Chromosomes, Human, Pair 13
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Chromosomes, Human, Pair 18
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Down Syndrome / diagnosis
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False Positive Reactions
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Female
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Genetic Testing*
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Humans
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Maternal Serum Screening Tests*
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Predictive Value of Tests
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Pregnancy
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Risk Assessment
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Risk Factors
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Trisomy / diagnosis*
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Trisomy 13 Syndrome
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Trisomy 18 Syndrome