The importance of the urine flow rate in semi-quantitative assessment of the standard renogram

Renograms were recorded at different rate of urine flow in 30 healthy Nigerian children to establish semi-quantitative criteria to assess the standard renogram. The results indicate that knowledge of the urine flow rate during renography is necessary for meaningful interpretation of the study. They further showed that for semi-quantitative assessment of the renogram the time to peak and time to peak half values are easily identified indexes that can be measured accurately with negligible observer variation. Regression equations for the relationship between urine flow rate on the one hand, and time to peak and time to peak half values on the other have been obtained and used to compute nomograms, which should be useful for future work in this area.