Index of overall renal function; appears in the urine when reabsorption is incomplete because of proximal tubular damage:

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Multiple Choice

Index of overall renal function; appears in the urine when reabsorption is incomplete because of proximal tubular damage:

Creatinine serves as a practical index of overall renal function (GFR) because it is produced at a relatively constant rate and is freely filtered with minimal influence from tubular handling, so the amount excreted reflects GFR. Beta-2 microglobulin (beta-microglobulin) is a low‑molecular‑weight protein that is normally filtered by the glomerulus and almost completely reabsorbed in the proximal tubule. When proximal tubule reabsorption is impaired, this protein is no longer reabsorbed efficiently and appears in the urine, signaling tubular dysfunction. Thus, pairing creatinine as the measure of overall renal function with beta-microglobulin as a marker that appears in urine when proximal tubular reabsorption is defective fits the described scenario.

Creatinine serves as a practical index of overall renal function (GFR) because it is produced at a relatively constant rate and is freely filtered with minimal influence from tubular handling, so the amount excreted reflects GFR.

Beta-2 microglobulin (beta-microglobulin) is a low‑molecular‑weight protein that is normally filtered by the glomerulus and almost completely reabsorbed in the proximal tubule. When proximal tubule reabsorption is impaired, this protein is no longer reabsorbed efficiently and appears in the urine, signaling tubular dysfunction.

Thus, pairing creatinine as the measure of overall renal function with beta-microglobulin as a marker that appears in urine when proximal tubular reabsorption is defective fits the described scenario.

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