Do I need to fast for kidney function tests? What is the effect of diet on kidney function tests?

Hello, common methods and precautions for renal function tests: 1. Endogenous creatinine clearance test, which is more common when renal function tests the degree of glomerular damage.

Eat a low-protein diet for three days before and on the day of the test, abstain from meat, and avoid strenuous exercise. On the day of the test, urine was drained at 8 a.m., and the urine was added to a clean container with toluene preservatives for 24 hours up to 8 a.m. On the day of the test, 2 3ml of venous blood was drawn.

Blood and urine are sent for testing at the same time. Normal values range from 109 148 litres for 24 hours (or 80 120 milliliters) and mean 128 liters for 24 hours (or 100 milliliters). Clearance is less than 80% of normal, suggesting glomerular hypofiltration.

Clearance was slightly reduced at 70 to 51 ml, moderately reduced at 50 to 31 ml, and severely reduced at less than 30 ml. Clearance is divided between 20 and 11 ml for early renal insufficiency, at 10 6 ml for advanced renal insufficiency, and less than 5 ml for end-stage renal insufficiency.

2. Blood urea nitrogen and blood creatinine measurement, which are commonly used tests for renal function tests.

Take 1 ml of venous blood, inject it into the anticoagulant tube, and mix thoroughly. Normal blood urea nitrogen is 9 20 mg litres and serum creatinine is 1 2 mg litres. Renal insufficiency is elevated in various severe kidney diseases.

Upper gastrointestinal bleeding, severe infections, and excessive protein in the diet can all cause a temporary increase in blood urea nitrogen. Serum creatinine concentration is less affected by diet and other factors, and when it is significantly elevated, it indicates a poor prognosis.

3. Phenol red (PSP) excretion test: aspirin, penicillin and other drugs cannot be used before the test. Diuretic beverages such as tea and coffee should be avoided before and during the test.

20 minutes before the test, the patient is instructed to urinate first, then drink 300 400 ml of water, and then do not drink any more water. Accurately aspirate phenol red solution with a 1 ml syringe and inject 1 ml by intravenous injection. After injection, urine should be collected once in minutes, collected in a clean specimen bottle, and sent for testing in a timely manner.

The excretion rate at 15 minutes after normal injection is at or equal to 25%, and the total excretion rate at 120 minutes is greater than 55%. If it is less than normal, it indicates renal impairment, and diseases that can cause changes in renal blood flow, such as heart failure, severe hypertension and pyelonephritis, also reduce the excretion rate of phenol red.

4. Urine concentration and dilution function test

On the day of the experiment, the patient was taken a normal diet. Urinate every three hours during the 24-hour period of the day and night, and collect them separately in clean specimen bottles. The normal ratio of daytime to nighttime urine output is 3 4 1; 12-hour nocturnal urine output not exceeding 750 ml; The highest specific gravity of urine is above.

The difference between the highest specific gravity is not less. Nocturnal urine output of more than 750 mL is often an early manifestation of renal insufficiency; Highest specific gravity less than indicates renal concentrating insufficiency; The specific gravity of each specimen was very different, and the specific gravity of urine was mostly fixed on the left and right, indicating that the renal concentration function was seriously impaired. The daytime urine ratio is fixed or higher, and most patients are dehydrated. **It depends on the region, hospital level, etc.

Kidney function tests are often used to measure changes in kidney function using urine microscopy and chemistry tests, as well as certain chemical tests of the blood. Therefore, it is necessary to fast, fast, and fast for 12 hours. The results are usually available in the afternoon or the next day.

No. If the hospital is big, it will be the next day. Just 100-200 pieces of color ultrasound!

Renal function tests are often used to measure the deterioration of kidney function by urine microscopy and chemical tests, as well as certain chemical tests of the blood. Therefore, filial piety potatoes should be fasting, fasting, abstinence, and caution for 12 hours. The results are usually available in the afternoon or the next day.

But where there is a heavy taste of the dish, not only is there a lot of oil, but more importantly, there is a lot of salt, a lot of soy sauce, and a lot of monosodium glutamate. This kind of dish tastes delicious, but after eating it for a long time, your taste buds will become numb, and you will not feel much about the light meal. It is recommended that you still adapt to the lighter.

For example, put salt only when cooking dishes, don't put salt when you put soy sauce, and eat less pickles and pickles. It is recommended to cook noodles without salt, and you can add other seasonings, such as green onions, ginger, garlic vinegar to taste, which can save salt.

2. I don't like to drink water.

Many people can't drink a glass of water in a morning. This is a bad habit, don't wait until you're thirsty to drink water. When you are thirsty, you drink water, but your body is already short of water.

Drinking less water decreases urine output, increases the concentration of waste and toxins carried in the urine, and makes it easy to form kidney stones. So my advice is to drink water every 1 hour and take small sips. Drinking plain water is much stronger than drinking beverages, which are full of added sugar and high in energy.

Carbonated drinks contain almost no nutrients, and caffeinated beverages are more likely to form stones and cause blood pressure to rise. In addition to drinking plain water, you can also drink light lemonade, chrysanthemum tea, black tea, green tea, etc.

3. Drink a lot of beer.

In summer, men love to drink beer, drinking too much beer can promote gallstones, fourth, not to eat too much high-protein food.

After the protein enters the human body, the liver is the main metabolizing organ of protein, and the main place for the catabolism of essential amino acids in protein is the liver. If you consume too much protein, it is bound to increase the burden of catabolism on the liver, which can adversely affect the body. 

Generally, the examination is done on an empty stomach.