很多醫療人員都曉得這個懷孕分級，但其實對真正的定義和全文卻是很清楚，現在提供給大家作為參考
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Category
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Interpretation
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A
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Controlled studies show no risk
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|
Adequate, well-controlled studies in pregnant women have failed to demonstrate risk to the fetus
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|
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B
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No evidence of risk in humans
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Either animal findings show risk (but human findings do not) or, if no adequate human studies have been done, animal findings are negative.
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C
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Risk cannot be ruled out
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Human studies are lacking and animal studies are either positive for fetal risk or lacking as well. However, potential benefits may justify the potential risk.
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D
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Positive evidence of risk
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Investigational or postmarketing data show risk to fetus. Nevertheless, potential benefits may outweight the risk.
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X
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Contraindicated in pregnancy
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Studies in animals or humans, or investigational or postmarketing reports have shown fetal risk which clearly outweighs any possible benefit to the patient.
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中文解說：FDA懷孕用藥分級
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