A Lasix renal scan assesses kidney function, specifically evaluating blood flow and urine production in each kidney. It involves two phases:
Baseline Imaging: A radioactive tracer is injected intravenously. A gamma camera then creates images showing the tracer’s distribution in the kidneys. This reveals initial blood flow and kidney function. Post-Lasix Imaging: After the baseline images, you receive an injection of Lasix (furosemide), a diuretic. This medication promotes increased urine production. Further imaging occurs, tracking the tracer’s excretion to assess how well your kidneys respond to the diuretic. The speed of excretion reflects the effectiveness of renal function.
Preparation is straightforward. You’ll likely need to fast for several hours beforehand and might be asked to restrict fluid intake. Your doctor will provide specific instructions. Expect the procedure to take about 90 minutes, including both imaging phases. Slight discomfort from the injection is possible, but generally brief and minimal.
The results reveal several key aspects of your renal function:
- Renal blood flow: How much blood each kidney receives. Glomerular filtration rate (GFR): An estimate of how well your kidneys filter waste from your blood. Tubular function: How effectively your kidneys concentrate and excrete urine. Obstructions: The test can identify blockages in the urinary tract.
Your doctor will discuss your results in detail, clarifying any abnormalities and advising on further necessary steps. Remember to ask any questions you have about the procedure or its results during your consultation.
