How weird, and how strange. I cannot imagine why the person in charge of managing your diabetes (or helping you to do so) would not want to know your kidney function. Kidneys, feet, eyes, heart too at times - these are the standard monitoring sites. Sigh. Maybe I’m missing something. Are you by chance extremely young?
Regardless, even people with diabetes who are only 30 years old get all the standard tests, including eGFR, which stands for estimated Glomerular Filtration Rate and is the best study to determine kidney function, obtained from calculations of the patient’s age, gender, race, and serum creatinine level. (There are some medical professionals (and non professionals) who disagree with having a separate category for African Americans, by the way.) Another blood test besides creatinine is “BUN,” blood urea nitrogen, and like creatinine is a nitrogenous waste product, sent to the kidneys for excretion. BUN can be re-absorbed, but creatinine cannot which is why it is a lower number when measured. BUN is the concentration of urea in the blood and is directly related to metabolic function of the liver and excretory function of the kidneys.
Then there are the urine tests, which is what you originally posted about (protein in the urine). If you are struggling to get a doctor to do another urinalysis or kidney function tests (blood), I recommend ordering urinalysis test strips and doing the test on your own - just make sure the strips are not expired. Unlike a lot of medications, urine test strips really do degrade rapidly after they’re expired. And again, you can try to find a kidney foundation screening in your area for a free ACR – albumin to creatinine ratio, which is a urine test that estimates the amount of protein (albumin) in urine in a day. Creatinine is a waste product of protein breakdown, primarily body muscle mass. Albumin is a protein that is present in high concentrations in the blood. Virtually no albumin is present in the urine when the kidneys are functioning properly. However, albumin may be detected in the urine even in the early stages of kidney disease. Most of the time, both albumin and creatinine are measured in a random urine sample and an albumin/creatinine ratio (ACR) is calculated. This may be done to more accurately determine how much albumin is escaping from the kidneys into the urine.
This is more information than you wanted, probably, but I must say it’s curious that a doctor has not insisted on having kidney function tests. Everyone, not just those with diabetes, should have one! Is it possible, he/she has done it, but you don’t know or never saw the results?