several papers about diabetes and pregnancy,bertiniAM;obstetrician professor epm-unifesp;jean carl silva also.urine sugar is not the best way to diagnose diabetes or control help with sugar in blood anna bertini

WIlliams Obstetrics 24 edition has a lot of good info in chapter 54.

I have access to it online via the local health science library, but it's hard to copy and paste (format gets messed up).

If you need the charts, and don't have access to the book, let me know and I'll convert a few of the charts to PDF and attach.

Caveat, Upon initial look, I did not find specifics about urine concentration.

However, I am under the impression, from several sources that urine glucose is high if it's above "trace" level amounts. 

In theory, no glucose should be found in the urine unless blood glucose is above 160-180 mg/dL