The Zimnitsky Urine Test (Проба по Зимницкому) is a test used in Russia to assess the kidneys' capacity for concentration of urine.
Here's one English-language description (choose "select all" because some of the text is the same color with the background). Here's another English-language description.
The patient's urine is collected over a period of 24 hours in 8 different containers (one container for each 3-hour period), and then the samples from each of the containers are passed to the testing facility, along with the info on the amount of urine passed during each of these 3-hour periods, and the amount of liquid consumed over the day. As I understand, specific gravity is calculated for each period.
Is it used at all in the West? In Wikipedia, only the Russian-language article exists for this kind of test. Why is that so?
I recall that it was quite a chore to collect urine in these 8 jars when I was in a hospital with diabetes. Maybe some other test(s) are used instead of it in the West?
P.S. It is still used in Russia. I don't think it's used for blood sugar assessment, I think it's more for the assessment of kidney function. I don't know much about kidney function or its assessment, and a doctor recently advised me to take this test because my urine had an extremely low specific gravity, so I started reading up. I wanted to read up on this in English, because there's usually more in-depth info on tests and their interpretation in English, but to my amazement I only found information in Russian, so I asked this question here.