Abstract:

Objective To investigate the stability of routine urine dry chemical method in 24 h. Methods A total of 318 fresh urine specimens were collected. The specimens were determined immediately after collection,and the results were named as the results of 0 h. The specimens were determined after collection for 2,4,6 and 24 h,under room temperature（25± 2）℃ and 4 ℃,respectively. The pH value,specific gravity（SG）,leukocyte（LEU）,erythrocyte（ERY）,nitrite（NIT）,protein（PRO）,glucose（Glu）,bilirubin（Bil）,urobilinogen（URO） and ketone body（KET） were determined. Results Compared with the results of 0 h,the results of LEU and ERY of 4 h at room temperature had statistical significance（P<0.05）. The changes of LEU and ERY of 6 h at 4 ℃ had statistical significance（P<0.05）,but there was no statistical significance for other parameters within 24 h at either room temperature or 4 ℃（P>0.05）. Conclusions The stabilities of urine dry chemical method for different parameters within 24 h are different. The urine specimens should be determined within 2 h at room temperature,or within 4 h at 4 ℃. Some urine specimens from patients with special diseases should be determined as soon as possible,to ensure stability and accuracy.

Key words: Urine, Storage period, Stability