Fecaloccult blood test had a positive rate of 84% and 3 consecutive tests (positive rate 100%) are important rather than one test (positive rate 20%).
粪潜血试验的阳性率为84%，作1次试验的阳性率仅20%，连续3次试验的阳性率为100%。
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BACKGROUND: Guaiac-based fecaloccult blood tests (FOBTs) for colorectal cancer screening are not specific for human hemoglobin and have low sensitivity.