Inter-observer and intra-observer reproducibility of diferential Tc-99m DMSA uptake

One hundred and twenty-eight patients referred for DMSA scintigraphy were analyzed retrospectively. Two nuclear medicine specialists drew regions of interest around each kidney twice in different times. The first and the second observer's intraobserver and interobserver correlation coefficients were 0,998, 0,999, and 0,999, respectively. There was an excellent correlation (p<0,005). The mean absolute difference between the first and the second measurements of the first observer was 0,69 ñ 0,94 and the one of the second observer was 0,5 ñ 0,68. We conclude that measurement of relative renal function with Tc-99m scintigraphy is a reliable, simple and reproducible method