Ray Peat sees urine foam from a hormonal standpoint, having to do with high estrogen..But that does not apply to me.
And pretty much all conventional doctors, aligned with the Talmudist Google search engine, will tell you it is a kidney problem. All the time. No ifs and buts.
And it will be about the kidney dysfunctional based on its inability to keep protein, especially albumin, from being excreted.
So they pretend to verify this by measuring your eGFR. GFR means the glomerular filtration rate, which is quite simply the same as kidney filtration rate. Using a nebulous formula (of course it's based on 'science') involving serum creatinine, age, sex, and race. Based on this, you will know if your kidneys are okay or not. With you unaware that you are healthy, you maybe stricken thinking you have chronic kidney disease, from a scale of 1 to 5, the higher the worse your kidney is.
All because you're serum creatinine is high, and it is high because you excrete albumin.
And not because something is wrong with your kidneys. But because as a result of high albumin excretion, your blood volume is low, and because of that, your serum creatinine is high.
And blood volume is low because your blood has low albumin. And low albumin holds on to less salt, and less salt attracts less water into plasma, leading to low plasma volume and low blood volume.
Albumin is excreted by perfectly healthy kidneys, only because the albumin excreted is oxidized albumin. Albumin is oxidized because albumin is the main antioxidant outside our cells, and albumin protects us from oxidative stresses going on to keep our tissues from being destroyed by oxidative stress.
So watch out! Knowing this keeps voodoo doctors from destroying your kidneys through their voodoo drugs.
There's a lot of misinformation here.
Kidneys do not excrete protein normally.
Protein are like serrations that damage the filters in the kidney when they pass through. The more this happens, the more damage your kidneys get. This damage is (normally) irreversible. If you have protein in your urine, you probably have some level of kidney disease. It doesn't matter if you disagree with "Talmudist Google" on this, because this is how kidneys perform.
I am unaware why you believe eGFR is not a real thing. It's a lab of kidney filtration. There is an entire group of people over on r/kidneydisease who will take issue with everything you said.
With this considered, not all foamy urine is protein. There are videos on youtube of people with foamy urine checking their samples and showing negative.