In normal people, there is no bacteria in the new urine. Is based on urine culture culture urine inoculated to suitable for bacterial growth and reproduction of nutrition, in order to know whether the growth of bacteria, where urine found bacteria, there are 100 thousand or more than 100 thousand bacteria have diagnostic significance per milliliter of bacterial colony count, urine culture for examination of urinary system infection.
Urine culture: culture specimens include the following categories:
Natural discharge urine: different male and female urine discharged naturally, the contamination rate of <1%, so no need to use the urine culture, but as a growth period of urine culture more than 3 kinds of bacteria, and no more than 80% of the growth rate, especially there is a species of non pathogenic bacteria causing urinary tract infection, prompt samples of pollution, must collect urine to do training guidance.
Bladder urine: patients who can not urinate voluntarily need catheterization, but catheterization can induce bacteriuria and damage the urethral orifice. Therefore, suprapubic puncture can be used to remove urine from patients with no coagulopathy or abdominal wall defects. Urethral catheterization is necessary if the residual bladder volume or temporary bladder drainage is to be measured.
Indwelling catheter collected urine: male long-term indwelling catheter infections caused by chance more than women, this is because there are local complications, therefore, the use of catheters should be strictly controlled indications, indwelling catheter should use asepsis closed drainage, and if it is possible to pull out as early as possible.
If the natural discharge urine single or main bacteria colony number is larger than 103/ml, the diagnosis of male urinary tract of true and reliable. If used more than 105/ml standard, the sensitivity accounted for only 62%, a urine culture for the diagnosis of true bacteriuria in elderly, the reliability of >95%.
Beijing In China