In clinical practice, we often encounter patients who use urine glucose instead of blood glucose measurement because their families are poor or do not want to invest in medical care.
Although it is easy to estimate blood glucose by urine glucose without any damage or pain and at low cost, urine glucose may not always reflect blood glucose level truthfully.
When a diabetic patient has a normal renal glucose domain, sugar may appear in the urine only when the blood glucose exceeds 10.0 mmol/L, and the urine is characterized as positive for glycosuria, which is diabetes.
Monitoring urine sugar is not as accurate as blood glucose, the sugar in urine often reflects the blood glucose level a few hours ago, but not the blood glucose level at that time, and patients with neurogenic bladder with urinary retention cannot reflect the blood glucose level at that time. Moreover, qualitative monitoring of urine sugar is also affected by other substances, such as fructose and vitamin C, which can cause false positives, resulting in misinterpretation and even masking the condition and delaying treatment.
If money is indeed tight, I suggest you measure postprandial glucose, because postprandial glucose is often much higher than fasting in diabetic patients. Patients in remission from treatment may have normal fasting glucose, or elevated but not yet over the renal sugar domain, so fasting urine glucose qualitative is negative, but at this time postprandial hyperglycemia and postprandial urine glucose qualitative positive still exist.
Method of measuring urine glucose 2 hours after meal: urinate before meal and discard, urinate 2 hours after meal to measure urine glucose.