How many precautions do you know before a kidney function test?

Kidneys are the "barometer" of human metabolism. The results of kidney function tests can help us understand the health of the kidneys in a timely manner. So, how can we get more accurate kidney function test results? Mainly look at the following 4 points.

What should I pay attention to before testing blood creatinine and endogenous creatinine clearance?

In the first 3 days before testing blood creatinine and endogenous creatinine clearance, you should avoid strenuous exercise (to prevent excessive production of endogenous creatinine) and meat (to prevent excessive intake of exogenous creatinine), collect urine for 24 hours to accurately measure urine volume and urine creatinine concentration, and draw blood to check blood creatinine concentration.

What should you pay attention to before testing blood urea nitrogen?

Before testing blood urea nitrogen , avoid eating high-protein foods such as meat, eggs, fish and milk (to prevent excessive urea nitrogen produced by protein metabolism in food); avoid massive gastrointestinal bleeding (red blood cells and plasma proteins can be digested and decomposed to produce a large amount of non-protein nitrogen, which increases the urea nitrogen content in the blood), low systemic circulation capacity (such as dehydration, shock, heart failure, etc.), urinary tract obstruction (such as prostate hypertrophy, urinary stones, tumors) and other symptoms. Otherwise, it will interfere with the accuracy of the results.

What should you pay attention to before testing blood urea nitrogen?

Before testing blood urea nitrogen, avoid eating foods rich in purine, such as animal offal, seafood, and soup; avoid taking drugs that prevent the renal tubules from reabsorbing uric acid, such as aspirin and carboxybenzenesulfonamide. When suffering from blood diseases, malignant tumors, chloroform poisoning, lead poisoning and other diseases, uric acid levels may increase, but kidney function may not necessarily be a problem. Therefore, professional doctors need to consider comprehensively and scientifically interpret the test results.

Why do I need to fast before having my blood drawn to check my kidney function?

Every time you go to the hospital for a blood test, such as testing kidney function, the doctor will ask the patient "Have you eaten yet?" If the patient has eaten, the doctor will suggest that the patient have another blood test for kidney function next morning on an empty stomach. What is the reason for this?

This is because the food we eat has to go through the gastrointestinal tract for digestion and absorption, and in this process, the composition of the blood will be affected, and many blood test indicators will also be affected, including kidney function. Since the reference range of many test indicators is based on the blood test of healthy people on an empty stomach, the results of blood tests after a meal are not comparable with the normal reference range. Therefore, doctors often tell patients not to eat after 12 o'clock the night before the kidney function test, until the next morning before the blood test, so as not to affect the test results. In order to help doctors accurately judge the patient's kidney function and to avoid patients spending money in vain, it is necessary to fast before checking kidney function.

In short, these are the things that patients with kidney disease must pay attention to when checking their renal function. Only in this way can we get more complete renal function test results.