[KongchangAI]
Unverified80% confidenceTradeoffTime unknown

空腹时长与检查全面性存在权衡:胃镜/肠镜需要更长禁食和肠道准备,对老人负担大;若无消化道症状或家族史,可优先用便隐血+肿瘤标志物初筛替代,避免过度检查

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80%
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Long-term
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