What is considered the renal threshold for glucose in urine?

The renal threshold for glucose is defined as the plasma concentration at which glucose begins to appear in the urine. This threshold is typically around 160 to 180 mg/dl. When blood glucose levels exceed this range, the kidneys can no longer reabsorb all the glucose that passes through them, leading to glucose spilling into the urine. At this point, the transport mechanisms of the renal tubules become saturated, allowing glucose to be excreted.

Option B correctly identifies this range, being the most accepted value in clinical practice. Understanding the renal threshold is crucial for diagnosing conditions such as diabetes mellitus, where excessive glucose levels in the blood can lead to glucosuria, or glucose in the urine.