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99mTc-DTPA vs. creatinine clearanceIMDS-MDRD. The rectangles represent the clinical levels of GFR (see text). GFR, glomerular filtration rate; IMDS-MDRD, isotope dilution mass spectrometry-modification of diet in renal disease; 99mTc-DTPA, 99mTcdiethylene triamine pentaacetic acid.
