Renal blood flow

Renal blood flow (RPF) was measured using a clearance test. A substance is not only filtered from the glomerulus, but also excreted from the renal tubules in large quantities, and is not reabsorbed. After it once flows through the kidney tissue, it can be completely eliminated. The clearance rate of the substance represents the unit time. The amount of plasma flowing through the 'kidney. The commonly used method is intravenous injection of p-amino-mauric acid, taking blood samples at regular intervals, collecting urine samples, recording time, calculating the urine volume per minute, measuring the concentration of p-amino-mauric acid and hematocrit in plasma and urine, and then calculating the kidneys by formula Blood flow. This method is more tedious, and the clinical use of radioisotope tracing technology, 131 iodine and o-iodide sodium uroate in the precardiac body surface measurement method. Normal renal plasma flow is 500 ml to 700 ml / min. 1.73 square meters of body surface area.