Generally the foam produced by urination disappears within 5 minutes is more normal, but whether the urine is normal or not, you need to combine with other tests to determine.
Foam in urine is mainly due to the presence of tangible substances or inorganic salts in the urine, the surface tension of urine is not the same, the urine discharge process due to the impact of the urine flow and produce foam, usually most of the foam of varying sizes. Most of the foam in the urine disappears within 1 minute.
There is also a part of the population, the content of tangible substances and inorganic salts in the urine increased, the urine produced by the foam disappearance time may be prolonged, generally within 5 minutes disappearance is a normal phenomenon.
However, when there is protein in the urine, the urine foam will also increase, the disappearance time will also be extended, so you can not simply based on the disappearance time of the foam to determine whether the urine is normal, but also need to be combined with the results of the urine routine to make a comprehensive judgment.
It is recommended to go to the regular hospital for urine examination, if the urine results are abnormal, need to actively diagnosis and treatment.