C14检测流程ppt课件
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碳十四尿素呼气试验步骤英文回答:The carbon-14 urea breath test is a diagnostic test used to detect the presence of Helicobacter pylori (H. pylori) bacteria in the stomach. The test involves the administration of a small amount of carbon-14 labeled urea, which is a non-radioactive form of carbon. This urea is metabolized by the H. pylori bacteria in the stomach, resulting in the production of carbon dioxide (CO2) that can be detected in the breath.The first step of the test is to fast for a specified period of time, usually overnight, to ensure an accurate result. This is because the presence of food in the stomach can interfere with the accuracy of the test. After fasting, the patient is given a small amount of carbon-14 labeled urea to swallow. The urea is quickly absorbed into the bloodstream and transported to the stomach.Once in the stomach, the carbon-14 labeled urea is metabolized by the H. pylori bacteria. The bacteria produce an enzyme called urease, which breaks down the urea into ammonia and carbon dioxide. The carbon dioxide is then absorbed into the bloodstream and transported to the lungs, where it is exhaled in the breath.To measure the amount of carbon dioxide in the breath, the patient is asked to blow into a special collection bag or tube. The exhaled breath is collected and analyzed using a machine called a mass spectrometer. The mass spectrometer can detect the presence of carbon-14, which indicates the presence of H. pylori bacteria in the stomach.The results of the carbon-14 urea breath test are usually available within a few minutes. A positive result indicates the presence of H. pylori bacteria, while a negative result suggests their absence. This test is considered to be highly accurate and reliable in diagnosing H. pylori infection.中文回答:碳十四尿素呼气试验是一种用于检测胃中幽门螺杆菌(H. pylori)细菌存在的诊断试验。
医学体检中心碳14呼气试验操作规范
碳14呼气试验是一种准确、安全、快速、方便的检测方法。
该检测方法准确率高达95%以上,在临床上已经广泛应用。
是否按正确操作步骤做呼气试验,将影响检测结果,以下是检测流程。
1、受检者应空腹或进食两小时以后,温水吞服14C 尿素胶囊,静坐等待15-30分钟。
2、开启并取出呼气卡和吹气套嘴,将吹气套嘴按箭头方向套入呼气卡。
3、向卡内徐徐吹气,过程中可换气,但严禁倒吸。
4、吹气时间约为3~5分钟,当呼气卡指示窗内指示剂大部分由蓝色变为白色时,即可停止吹气。
将吹气套嘴取下丢入垃圾桶,呼气卡交予医护人员。
5、撕去呼气卡两面的蓝色标签,将呼气卡插入检测仪中,即可自动检测并打印诊断结果。
注意事项:
1、患者需空腹或进食后两小时后开始做此试验,用20ML凉开水冲服14C尿素胶囊一粒;
2、服胶囊后静坐15至20分钟后吹气,严禁倒吸,深吸气再对着呼气卡吹气3分钟,中间可以离开换气。
3、呼气卡颜色完全变成淡黄色,吹够3分钟,开始测量,如没有变色继续吹气约5分钟后停止,如还没变色,开始测量不影响测量结果。
4、呼气卡须大头插入,严禁小头插入,测量时严禁拔出呼气卡。
5、测量时间为250秒,结果DPM值大于等于50为阳性,小于40为阴性。
6、孕妇和哺乳期妇女不宜做此试验,儿童可做此试验。
7、阳性者停药后一个月须复查。
(幽门螺植杆菌是一种传染性细菌,建议家人也检查以根除,根除后再复发机率非常低)。