A group of The Memorial Hospital Group, Istanbul, Turkey groups has made an interesting report that urine foaming can be an effective indicator for diagnosing and predicting the prognosis of COVID-19.
http://www.nclin.ist/jvi.aspx?un=NCI-42027&volume=
The urine of patients hospitalized for COVID-19 or in ICU was reddish from orange in color, and the new coronavirus was diagnosed by collecting urine with a test tube and observing the foaming condition after shaking for 15 seconds.
The accuracy of the diagnosis was 92% sensitivity and 89% specificity.
The urine of healthy people is usually light yellow to light yellow-brown, and there is no basic problem if urine bubbles disappear shortly after urination.
However, it is well known that the color of urine changes with the disease state, and
when urobilinogen, urine protein and urine sugar in the urine increase, it becomes more foamy.
It may be reasonable to think of it as a reference only.