Zuo L, Ying Chun -, Wang M, Zhang C, Wang R, Wang H. Prediction of two-sample (99m)Tc-diethylene triamine pentaacetic acid plasma clearance from single-sample method. Ann Nucl Med. 2005;19:399-405 pubmed
..sGFR becomes widely scattered when tGFR is less than 30 ml/min/1.73 m2. To obtain reliable reference GFR values, it is recommended that DPSM be used in clinical trials when aGFR is less than 45 ml/min/1.73 m2. ..
Zuo L, Ma Y, Zhou Y, Wang M, Xu G, Wang H. Application of GFR-estimating equations in Chinese patients with chronic kidney disease. Am J Kidney Dis. 2005;45:463-72 pubmed