Protein in urine

I notice a test for protein in the standard blood/urine annual
check-up tests.

1) The body produces tens of thousands of different proteins. Which
protein are we talking about?

2) Depending on the answer to (1), do we know which protein is
produced by which cell and which organ?

3) What's the resolving power of the urine tests? The lab website and
of course the lab report don't say. Since we seem to be able to detect
parts per billion of things like lead can we do the same here (e.g. 1
molecule of x protein in 50 ml urine sample).


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