blood urea

The blood urea test is an auxiliary test method for checking whether the urination function is normal. Urea is the end product of protein metabolism in the body, which is mainly excreted from the urine by glomerular filtration. The production of blood urea is affected by many factors, such as high protein diet, gastrointestinal bleeding, trauma, infection, fever, malnutrition or steroid corticosteroid treatment, the production of urea is significantly increased and blood urea is increased. . Serum creatinine is derived from muscle tissue release. The yield depends on the total amount of muscle tissue, is relatively constant, and is less affected by metabolism and disease state. The estimation of renal function is better than blood urea. Therefore, there will be a case where blood urea is high and creatinine is not high. Basic Information Specialist classification: urinary examination classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Tips: It is best not to have breakfast before the examination, and at least three days before the examination should be light diet, do not drink alcohol, overeating or excessive fatigue, so as not to affect the test results. Normal value Normal situation 3.2 ~ 7.0mmol / L. Clinical significance Abnormal results increased acute and chronic nephritis, severe pyelonephritis, acute and chronic renal dysfunction caused by various causes, heart failure, shock, burns, water loss, massive internal bleeding, adrenal insufficiency, prostatic hypertrophy, chronic urinary tract obstruction, etc. . People who need to be examined: patients with nephritis. Precautions Taboo before the test: It is best not to have breakfast before the test, and the diet should be light at least three days before the test, do not drink alcohol, overeating or excessive fatigue, so as not to affect the test results. Requirements for examination: The patient actively cooperates with the doctor and the doctor carefully operates to avoid the result. Inspection process (1) Prerenal disease: The most important cause is loss of water. The blood flow is reduced, the renal blood flow is reduced, and the glomerular filtration rate is lowered, resulting in an increase in serum urea concentration. Common in severe vomiting, pyloric obstruction, long-term diarrhea. (2) renal diseases: acute glomerulonephritis, advanced kidney disease, renal failure, chronic pyelonephritis and toxic nephritis and other diseases affecting glomerular filtration, can cause increased serum urea content. (3) Post-renal diseases: such as enlarged prostate, urinary calculi, urethral stricture, bladder tumor caused by urethral compression, etc., all urinary tract obstruction factors can cause increased blood urea content. In addition to being affected by kidney function, blood urea concentration is also affected by the actual state of protein decomposition. Therefore, blood creatinine measurement can more accurately reflect glomerular function than blood urea determination. Reduced serum urea concentration: in addition to infants, pregnant women and low-protein high-sugar diet, common in patients with liver failure. Not suitable for the crowd Inappropriate people: Generally, there is no suitable for the crowd. Adverse reactions and risks No related complications or hazards.