If the family doctor prescribes a kidney function test, most patients are puzzled. What is the procedure for the kidney function test? What is being tested, and how is that happening? A lot of questions, which we answer below.
When do you need the kidney function test?
The two kidneys are our two main excretory organs for all waste products that are water-soluble. In addition, they regulate the entire water and electrolyte balance and are responsible for a number of important physiological functions, including the regulation of blood pressure. Many laboratory parameters can be determined with a simple urine test or with blood tests such as creatinine, urea, and uric acid.
If these urine values and kidney values are no longer sufficient for a diagnosis, you must perform a kidney function test. It reveals how well the kidneys are perfused and how much urine is formed and excreted. In this case, a separate assessment of the paired organs is possible.
Sequence Renal function test- The most important:
- The kidney function test (kidney scintigraphy, radioisotope nephrography) is used to examine the kidneys for their ability to ultrafiltration.
- In the run-up, an informational discussion takes place, in which the doctor explains the procedure and gives written informed consent. If necessary, the intake of some medications must be suspended before the examination.
- For the actual investigation, sufficient hydrogenation is necessary. The patient receives one or two venous indwelling cannulas for injection and if necessary, blood collection.
- The kidney is visualized with a radioactive tracer, which collects after injection in the urinary tract and is tracked with a gamma camera.
At the same time, blood samples can be taken to measure the remaining radioactivity in the blood.
Kidney function test - How do the kidneys work?
The kidneys work as a highly efficient filtration system. In the renal corpuscles (glomeruli), the blood runs through a ball of capillaries separated from the urinary tract by a very thin layer of endothelial cells. These endothelial cells act as a filter: small molecules and ions such as water, sodium, and chloride can pass the barrier, whereas large particles such as blood proteins or blood cells are retained. This process is called ultrafiltration.
The amount of primary urine formed corresponds to the glomerular filtration rate (GFR) and creatinine clearance, two important laboratory parameters for kidney filtration performance. The entire blood volume goes through the kidneys about 300 times a day- a good 1,500 liters. The result is 180 liters of primary urine. Before undergoing a LFT, you should know the liver function test cost in Delhi.
Such a loss of water and electrolytes would be fatal. Therefore, in the distal renal tubules, a reabsorption takes place, with the liquid and minerals are specifically brought back into the bloodstream. Through this recovery, the body can accurately tare the electrolyte and water balance. What remains is one to two liters of final urine, which we eliminate daily.