Renal blood flow as measured with 133Xe wash out and 86Rb uptake techniques and with an electromagnetic flowmeter.

The values for total RBF measured with 133Xe and 86Rb methods are nearly equal to that measured simultaneously with an electromagnetic flowmeter. A high degree of correlation was found between the values estimated by the three methods. No significant correlation was, however, found in the perfusion of the individual kidney regions (cortex, outer and inner medulla) measured with 133Xe wash-out and 86Rb uptake techniques.