Urine sugar and blood sugar levels are not necessarily parallel, so it is not possible to convert a clear and specific value. Generally speaking, if the blood glucose value is higher than the renal glucose threshold, the kidneys are unable to reabsorb the excess sugar, resulting in excretion from the urine, and glucose will appear in the urine. Positive urinary glucose is indicated by a +, and the more + signs on the lab results, the more glucose is present in the urine. If the urine routine results of urine sugar 3 +, should first consider to endocrinology consultation, need to rule out whether it is caused by diabetes. If the blood sugar is normal, we should consider other causes of elevated urine glucose, such as pregnancy, kidney disease and other diseases that can cause changes in the renal glucose threshold. If you want to know the value of blood glucose, it is recommended to do relevant blood tests and blood glucose tests under the guidance of a doctor to get the specific value of the results.