What is a urea blood test?
Overview. A common blood test, the blood urea nitrogen (BUN) test reveals important information about how well your kidneys are working. A BUN test measures the amount of urea nitrogen that’s in your blood.
What is normal level of urea in blood?
The normal range of urea nitrogen in blood or serum is 5 to 20 mg/dl, or 1.8 to 7.1 mmol urea per liter. The range is wide because of normal variations due to protein intake, endogenous protein catabolism, state of hydration, hepatic urea synthesis, and renal urea excretion.
What is the principle of urea estimation?
In this method to estimate blood urea, blood plasma or serum is used. It is based on the principle that urea is hydrolysed into carbonic acid and ammonia by enzyme urease. The ammonia produced is measured photometrically after its reaction with phenol in the presence of hypochlorite (Berthelot reaction).
Which method is used for the measurement of urea?
Commonly used methods for urea determination are based on enzymatic and chemical assays. Enzymatic methods use the urea-metabolizing enzyme urease (Machado and Horizonte 1958), which degrades urea into ammonia. The produced ammonia is measured by a pH indicator (Orsonneau et al.
What is high urea level?
Normal BUN levels vary, but high levels in your blood sample usually mean your kidneys aren’t working normally. They can be a sign of kidney disease or failure. Higher than normal BUN levels may also indicate dehydration, high-protein diet, medications, burns or other conditions.
What if urea is high?
Uremia can lead to kidney failure when left untreated. Someone with uremia may have seizures, loss of consciousness, heart attacks, and other life-threatening symptoms. Some will need a kidney transplant. Kidney failure may also damage other organs, so untreated uremia can result in liver or heart failure.
What is normal range of urea and creatinine?
We defined the normal range as range within the single SD-line of the remainder. The estimated normal range of BUN was 14-23 mg/dl both in male and female elderly subjects, and that of Cr was 0.9-1.3 mg/dl in male and was 0.7-1.1 mg/dl in female.
Why is urea measured?
Urea and creatinine levels are used to evaluate how well the kidney is working and to monitor patients with kidneys that are diseased or those receiving kidney dialysis.
What is the clinical significance of testing for urea?
Purpose of a urine urea nitrogen test Your doctor will usually recommend a urea test to determine protein levels in the body. The test can determine how much protein you’re eating, and if it’s an adequate amount. In addition, your urea nitrogen levels may rise if you’re going through heart failure or dehydration.
How can we check urea purity?
To detect adulteration in the Urea, take 1 gm fertilizer in test tube and add 5 ml distilled water to dissolve the material. Add 5-6 drops of Silver Nitrate Solution. The formation of white precipitate indicates that material is adulterated. The non formation of any precipitate indicates that Urea is pure.
Which Colour reagent is used in estimation of urea?
Ammonia reacts with Berthelot’s reagent to form a blue product which is used in a colorimetric method for determining ammonia. The reagent can also be used for determining urea. In this case the enzyme urease is used to catalyze the hydrolysis of urea into carbon dioxide and ammonia.