尿素氮
<p><span style=";font-family:宋体;font-size:14px">尿素氮(<span style="font-family:Calibri">BUN</span><span style="font-family:宋体">)是人体蛋白质代谢的主要终末产物。氨基酸脱氨基产生</span><span style="font-family:Calibri">NH3</span><span style="font-family:宋体">,和</span><span style="font-family:Calibri">C02</span><span style="font-family:宋体">,两者在肝脏中合成尿素,每克蛋白质代谢产生尿素</span><span style="font-family:Calibri">0</span><span style="font-family:宋体">.</span><span style="font-family:Calibri">3g</span><span style="font-family:宋体">。尿素中氮含量为</span><span style="font-family:Calibri">28/60</span><span style="font-family:宋体">,几乎达一半。通常肾脏为排泄尿素的主要器官,尿素从肾小球滤过后在各段小管均可重吸收,但肾小管内尿流速越快重吸收越少,也即达到了最大清除率。和血肌酐一样,在肾功能损害早期,血尿素氮可在正常范围。当肾小球滤过率下降到正常的</span><span style="font-family:Calibri">50%</span><span style="font-family:宋体">以下时,血尿素氮的浓度才迅速升高。<a href="http://jbk.39.net/jiancha/nsd1/" style="margin: 0px; padding: 0px; border: 0px; font-stretch: inherit; font-size: 14px; line-height: 26px; font-family: Verdana, SimSun; vertical-align: baseline; color: rgb(0, 102, 153); text-decoration: none; text-indent: 28px; white-space: normal; background-color: rgb(255, 255, 255);">尿素氮</a><span style="color: rgb(51, 51, 51); font-family: Verdana, SimSun; font-size: 14px; line-height: 26px; text-indent: 28px; background-color: rgb(255, 255, 255);">的变化对非蛋白氮数值的影响较大。临床上常选用</span><a href="http://jbk.39.net/jiancha/nsu/" style="margin: 0px; padding: 0px; border: 0px; font-stretch: inherit; font-size: 14px; line-height: 26px; font-family: Verdana, SimSun; vertical-align: baseline; color: rgb(0, 102, 153); text-decoration: none; text-indent: 28px; white-space: normal; background-color: rgb(255, 255, 255);">尿素</a><span style="color: rgb(51, 51, 51); font-family: Verdana, SimSun; font-size: 14px; line-height: 26px; text-indent: 28px; background-color: rgb(255, 255, 255);">氮的检测来代替非蛋白氮的测定。适用于肾功能损害的患者。</span></span></span></p>
目录:
1.检查须知
2.临床意义
3.检查过程
4.不适宜人群
5.相关检查
检查须知
<p class="p" style="margin-top: 0px; margin-bottom: 0px; padding: 0px; border: 0px; font-stretch: inherit; font-size: 14px; line-height: 26px; font-family: Verdana, SimSun; vertical-align: baseline; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">1、血清尿素氮存在着生理变动,如男性高于女性;随年龄的增加可升高。在抽血前应素食,不宜进食含高蛋白质的饮食,且不宜进行剧烈运动。</p><p class="p" style="margin-top: 0px; margin-bottom: 0px; padding: 0px; border: 0px; font-stretch: inherit; font-size: 14px; line-height: 26px; font-family: Verdana, SimSun; vertical-align: baseline; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">2、妇女妊娠期血清尿素氮可降低。</p><p class="p" style="margin-top: 0px; margin-bottom: 0px; padding: 0px; border: 0px; font-stretch: inherit; font-size: 14px; line-height: 26px; font-family: Verdana, SimSun; vertical-align: baseline; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">3、某些药物可使血尿素氮升高,如阿司匹林、保泰松、吲哚美辛、氯噻酮、呋塞米、水合氯醛、庆大霉霉素、新霉素、卡那霉素等;有的药物可使血尿素氮降低,如链霉素、氯霉素等。</p><p><br/></p>