临床上因肾功能损害而致血尿素氮增高的病例很多,而因其它原因使血尿素氮极度减少的病例罕见,为引起临床实验诊断的重视,现将笔者所遇1例报告如下。1　病例介绍患儿,男,1212岁,父母均为城郊农民,因水样便腹泻3d,发热2d入院。查体:患儿精神欠佳,体温38.5℃,入院当日腹泻8次,实验 Clinically due to renal damage caused by increased blood urea nitrogen, many cases, and other reasons to extremely reduce the blood urea nitrogen cases rare, in order to cause clinical laboratory diagnosis, I now encounter a case report as follows. 1 case description Children, male, 1212 years old, both parents are farmers in the suburbs, diarrhea because of water samples will be 3d, fever 2d admission. Physical examination: children with poor health, body temperature 38.5 ℃, diarrhea on the day of admission 8 times, the experiment