[What is accomplished by sonographic studies of the kidneys?].

Sonography of the kidneys can be regarded not only as supplementary examination to intravenous pyelograms but as first step investigation for evaluation of hypertension, micro-hematuria and other acute processes. Since no contrast medium and no ionizing radiation is used it can be applied to pregnant women and also in cases of acute renal failure. Together with needle biopsy its diagnostic value is immense and it can be repeated as often as wanted even as a bed-side method. Therefore it can be used routinely for follow-ups.