Final answer:
Glycosuria generally occurs when blood glucose exceeds 180 mg/100 ml. At this threshold, the kidney reabsorbs 350 mg of glucose per minute, and any amount of glucose beyond this is excreted.
Step-by-step explanation:
Glycosuria generally occurs when blood glucose exceeds 180 mg/100 ml. When the glucose concentration in the blood exceeds this value, it is excreted in urine. This condition is known as renal threshold for glucose. At this threshold, the kidney reabsorbs 350 mg of glucose per minute, and any amount of glucose being filtered by the glomerular filtrate more than this is excreted.