目的　探讨SPECT在小肠出血诊断中的意义。方法　对拟诊消化道出血的 16例患者 ,采用99Tcm 体内标记红细胞法 ,行全腹部动、静态显像。结果　 16例患者中 14例显示有小肠出血征象 ,其阳性率为 87 5 % ;阳性患者 9例手术 ,其中 7例SPECT诊断的出血部位与手术所见吻合 ,SPECT定位准确率 77 78%。结论　SPECT对小肠出血的诊断及定位具有重要参考价值 Objective To investigate the significance of SPECT in the diagnosis of intestinal bleeding. Methods Twenty-six patients with suspected gastrointestinal bleeding were treated with 99Tcm-labeled red blood cells in vivo and performed whole-abdominal dynamic and static imaging. Results Of the 16 patients, 14 showed signs of small bowel bleeding, with a positive rate of 87.5%. Nine of the positive patients underwent surgery. Among them, 7 were diagnosed by SPECT and the bleeding sites were consistent with the surgical findings. The accuracy of SPECT was 77 78%. Conclusion SPECT has an important reference value for the diagnosis and localization of small intestinal bleeding