Risks and precautions Rarely there is leakage from the vein in the leg after a catheterization test. If you notice any back pain or blood in your urine after the test, tell your doctor. Blood sample may be ordered in prone position. If upright sample is taken, you stand or sit upright for 2 hours before test. Position used is physician's choice.
Results vary, but interpretation is the same.
For the sodium-depleted renin test, you receive furosemide. If you have angina or cerebrovascular insufficiency, you receive chlorothiazide. Discontinue diuretics, anti-hypertensives, vasodilators and oral contraceptives for 2 to 4 weeks before the test. Inform the person performing the test if you have recently taken any of the other medications listed under Taking these drugs may affect test results. Roll up sleeve only.