Urine sugar and diabetes
Posted on September 25, 2009
Filed Under Ketoacidosis | Leave a Comment
Does the body produce urine depends on renal sugar threshold (typically for 8.9 ~ lO mmol / l), renal glucose threshold is like the highest point of an embankment, while the blood glucose is like water. When the blood glucose levels higher than this, “the highest point of the embankment”, the sugar, kidney overflow “run” to the urine caused by urine inside positive; and vice versa negative urine glucose.
Urine is the urine sugar (mainly glucose), normal urine were negative. Generally when the blood sugar more than 8.9 ~ 10 mmol or when the sugar before entering the urine, urine sugar test positive at this time. Therefore, under normal circumstances, urine sugar’s negative, positive and blood glucose in normal and abnormal coincide. But this is not absolute, and sometimes the opposite.
Negative urine sugar diabetes can not be excluded
60-year-old Lin lady foot some unexplained itching, in some places even ulceration, Waicha, Oral multiple drugs, the result is not bad. Doctors suggested that she be a blood sugar screening, together with her son, said: “The last time my mother did when reviewing nephropathy urine sugar test is negative, it should not be a diabetic it.”
Doctor said: “not necessarily! Negative urine may also be suffering from diabetes, you still go to check blood sugar bar!”
Mother and son took over the checklist, paid the costs, blood sugar checks at coming together. Along the way some of them do not understand is not Montreal, whispered: “This will not be the doctor would like to close our money, right?”
Really a doctor would like to make money? Answer is no! Lin mother really need to test her blood sugar to determine whether adequate diabetes.
It turned out that the human body depends on whether the kidney produce urine sugar threshold (typically for 8.9 ~ lO mmol / l), renal glucose threshold is like the highest point of an embankment, while the blood glucose is like water. When the blood glucose levels higher than this, “the highest point of the embankment”, the sugar, kidney overflow “run” to the urine caused by urine inside positive; and vice versa negative urine glucose. When the “embankment” heightened, even when blood sugar is higher than the original that position or even higher, but the sugar is “running” is not out, can not enter the urine, the urine test is still negative. Such as elderly patients with diabetes and diabetic nephropathy in patients with elevated renal glucose threshold, even if the blood glucose over 10 mmol / l or 13.9 ~ 16.7 mmol / l, urine is also negative.
Blood glucose test results showed that Lin-law, her blood glucose values have higher than normal, diagnosed with diabetes. Her urine was negative because she was suffering from diabetic nephropathy, renal blood flow due to reduction in glomerular filtration rate decreased, renal tubular recovery of normal, a result of increased renal glucose threshold.
Positive urine sugar diabetes does not necessarily
Lin-law with the opposite condition to participate in the examination of Mr. Shen, and his urine was positive, but the blood glucose test is negative, the doctor ruled out the possibility he is suffering from diabetes, and instead check the other causes.
In addition to the positive urine sugar found in patients with diabetes, there are the following: (1) kidney disease. Such as chronic nephritis, nephrotic syndrome, familial diabetes and neonatal diabetes and so on, due to impaired renal reabsorption of sugar, so that part of the sugar from the urine leakage, causing urine test was positive, but normal blood glucose; (2) endocrine disease. Such as the thyroid, adrenal cortex, the brain function of anterior pituitary and other endocrine hyperfunction; (3) the influence of drugs. Such as aminopyrine, vitamin c, oral contraceptives. (4), cerebral hemorrhage, brain tumors, skull fracture, brain trauma, as well as in the short term excessive intake of food with high sugar content, there will be a temporary urine sugar positive, with the condition of the mitigation, cessation of eating such food , the urine will be converted into negative.
It is noteworthy that, although the urine in the diagnosis of diabetes, when there are so many uncertainties, but if the urine sugar positive, first of all, or should be suspected diabetes; another aspect, urine-positive can not be in the absence of other checks on the blind treatment .
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