What are the precautions before a kidney function test?

The kidneys are important organs for excreting water, metabolites, poisons and drugs, and retaining the substances needed by the body to maintain the acid-base balance of water and electrolytes in the body. In addition, the kidneys have endocrine functions. Because of the multifaceted functions of the kidneys and their strong reserve capacity, even the most sensitive tests cannot detect early and minor renal parenchymal damage.

Therefore, the judgment of renal function cannot be made based on the results of a single test, but a comprehensive analysis of other clinical manifestations is required to draw a firm and reliable conclusion. There are many items of renal function test, including endogenous creatinine clearance, blood urea nitrogen, blood urea, blood creatinine, blood uric acid, urine creatinine, urine protein, inulin clearance, selective proteinuria index, 2 microglobulin clearance test, urea clearance rate, urea nitrogen creatinine ratio, phenol red excretion test, concentration test, dilution test, p-aminohippuric acid clearance, etc. Through the above examinations, acute and chronic nephritis, pyelonephritis, various acute and chronic renal dysfunctions, glomerular diseases, renal tubular diseases, renal failure, uremia, etc. can be found.

Renal insufficiency is caused by a variety of reasons, and the glomeruli is severely damaged, so that the body has disorders in excreting metabolic wastes and regulating water, electrolytes, acid-base balance, etc. It is divided into acute renal insufficiency and chronic renal insufficiency. The prognosis is severe and is one of the major life-threatening conditions.

Attention should be paid to it. The kidneys are the most important excretory organs of the human body, and when the kidneys are dysfunctional, patients may have varying degrees of disorders in water, electrolytes, and pH values due to the inability to discharge metabolites normally in the body. There are many renal function tests, such as serum creatinine, serum urea nitrogen, creatinine clearance, uric acid, urease and microalbumin.

For routine medical checkups, it is not necessary to have a comprehensive examination of the kidneys, so only basic items are examined. In fact, in addition to the above items, a comprehensive renal function test also includes 24-hour urine protein quantification. Some renal impairment can precede symptoms, and renal function tests can detect kidney disease at an early stage, and can help diagnose and guide the location and extent of kidney damage**.

However, kidney function is not necessarily impaired in kidney disease because the kidneys have a large reserve capacity. Some abnormalities in kidney function appear only when kidney damage is evident. To do a kidney function test, be sure to do it in the morning on an empty stomach and not even drink water, because eating can affect blood sugar levels.

In addition, due to the increase in gastrointestinal contents after meals (especially full meals), various organs, including the kidneys, will be crowded to varying degrees, and the edges of the organs are not easy to show that there will be information missing. Confusing the results of the examination with the actual situation. In addition, there is no shortage of people with kidney deficiency in real life, and people usually need to eat some kidney tonic foods.

Animal meat, eggs, bone marrow, black sesame seeds, cherries, mulberries, yams, etc. also have different degrees of kidney tonic effects. Customers who want to consult directly, no charge, 24-hour service. Authoritative experts will answer your questions about physical examination and give you professional personalized guidance according to your situation.

1. The renal function test is mainly a urine test, and the kidney function test is recommended to be carried out in a regular tertiary hospital, which will be more assured, and the precision instrument is also a guarantee for the scientific results of the examination.

2. Do kidney function test on an empty stomach, and do not drink water, because eating will affect blood sugar levels, in addition, due to the increase of gastrointestinal contents after meals (especially full meals), various organs including the kidneys will be crowded to varying degrees, and the edge of the organ is not easy to show that there will be information missing. The results of the test are confused with the actual situation, so the kidney function test is usually done in the morning.

3. It is recommended that you usually eat some kidney tonic food. Animal meat, eggs, bone marrow, black sesame seeds, cherries, mulberries, yams, etc. also have different degrees of kidney tonic effects.

Precautions for renal function test: Before checking kidney function, you need to fast for 8-12 hours, and do not eat or drink during this period. It is recommended to go for the test in the morning, and the results are usually available on the same day.

What to look for in kidney function tests

Precautions before renal function tests

1. Fasting examination.

Before checking kidney function, it is necessary to fasting for 8-12 hours in the morning, and do not eat or drink during this period. Blood urine nitrogen, one of the items of renal function test, will be affected by some external factors, such as diet (such as high-protein diet), trauma, infection, gastrointestinal bleeding and hormone application, etc., will affect the accuracy of the results, so the examination of kidney function needs to be fasting.

2. It is recommended to go for an examination in the morning.

Whether it is a blood draw or urine test in the state, it is generally done in the morning of the day of the examination, and the examination is done in the morning, and the test results can generally be obtained on the same day.

Precautions after renal function tests

Venous blood draw: After the blood draw is completed, the blood drawing area should be pressed with three fingers for about 5 minutes to avoid bleeding. If there is bruising at the site of blood drawing after compression, there is no need to panic, the bruise usually resolves naturally, and a warm compress with a hot towel 24 hours after the blood draw can also speed up the resolution of the bruising.

Urine test: The urine should be sent to the laboratory for examination as soon as possible, because if the time is too long, there will be problems such as glucose being decomposed by bacteria, casts destroyed, and cell lysis, which will affect the accuracy of the test results.

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Urinalysis is the most common examination item for kidney patients, and it is very important to ensure the reliability of the examination results by taking urine routine specimens correctly. The following points should be taken when collecting urinalysis specimens.

1. Morning urine testing: Urine routine examination is generally the most suitable for morning urine testing. Morning urine refers to the first time to urinate when you get up in the morning, which is relatively thick, and the formed components in the urine are more than the diluted urine during the day, so it is easier to find the abnormality of urine, and it can also avoid the influence of factors such as diet, water, and exercise.

2. The urine specimen should be sent for testing within 1 hour: so as not to affect the formed components in the urine due to changes in pH, such as the destruction or shrinkage and deformation of red and white blood cells; In particular, when urine red blood cell microscopy is done, a fresh urine sample is sufficient.

3. It is best to take midstream urine for urine routine examination: to avoid inflammation of the urethral meatus, leucorrhea and other substances contaminating the urine and affecting the examination results. The method of retaining the middle section of urine is to remove the previous part of urine first, keep the middle section, and leave the last section of urine unprocessed.

Hourly, 24-hour urine retention: 12-hour urine is generally left to urinate at 7 p.m. to 7 a.m., and the urine is discarded at 7 p.m., and then the urine after 7 p.m. is left in a container until 7 a.m. the next morning. For 24-hour urine collection, the urine at the time of waking up (7 a.m.) is discarded first, and the urine after 7 a.m. is left in a container until the next morning until 7 a.m.

After recording the total amount of urine (or the weight of urine on a scale) for 12 or 24 hours, stir the urine well, and leave a vial (50-100ml) of urine sample for testing.

Be mentally prepared, don't eat anything before the examination, don't drink water, have an examination on an empty stomach, be prepared to face the disease, go to a blood test, and do color ultrasound.