I am doing my research on kidney disease. I would like to know which technique/test is better for calculating GFR. Can you please suggest to me the best imaging technique to calculate GFR. And please suggest which is best?

The is no absolute best technique.  Each of the ways of estimating glomerular filtration rate (eGFR) has positive and negative aspects of the testing.. Most authorities consider the careful measurement of inulin clearance or the use of iothalamate clearance as the gold standard for eGFR measurement.  There is a comprehensive discussion of this issue on our web site at:  https://www.kidney.org/professionals/KDOQI/gfr

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