131I-Hippuran Renography for Control of Patients with Ureterolithiasis

Abstract

The value of the ¹³¹I-Hippuran renography for control of patients with ureterolithiasis was investigated in a consecutive series of 58 patients with radiologically verified unilateral ureterolithiasis. Intravenous pyelography (IVP) and renography (RNG) were performed on admittance and 4–5 weeks later, the interval between the IVP and the RNG being 0–4 days. From 80 comparisons of the results of IVP and RNG (prevalence of abnormal IVP 73%), the predictive value of an abnormal RNG in the control situation was found to be 88% with a 95% confidence interval of 75–93%. The predictive value of a normal RNG was 88% (62–98%). If renography was combined with an X-ray of the abdomen at the control examination, the predictive value of an abnormal RNG was unchanged and the predictive value of a normal RNG increased to 100% (77–100%). On the basis of these high predictive values, a new examination protocol for control of patients with unilateral ureterolithiasis is put forward.