What is urea in kidney function test?

The test measures the amount of urea nitrogen in your blood. Urea nitrogen is one of the waste products removed from your blood by your kidneys. Higher than normal BUN levels may be a sign that your kidneys aren’t working efficiently. People with early kidney disease may not have any symptoms.

What is a normal creatinine level?

The typical range for serum creatinine is: For adult men, 0.74 to 1.35 mg/dL (65.4 to 119.3 micromoles/L) For adult women, 0.59 to 1.04 mg/dL (52.2 to 91.9 micromoles/L)

What is a normal creatinine level for a 73 year old woman?

A normal result is 0.7 to 1.3 mg/dL (61.9 to 114.9 µmol/L) for men and 0.6 to 1.1 mg/dL (53 to 97.2 µmol/L) for women. Women often have a lower creatinine level than men. This is because women often have less muscle mass than men. Creatinine level varies based on a person’s size and muscle mass.

What is a normal urea level?

In general, around 6 to 24 mg/dL (2.1 to 8.5 mmol/L ) is considered normal. But normal ranges may vary, depending on the reference range used by the lab and your age. Ask your doctor to explain your results. Urea nitrogen levels tend to increase with age.

What is normal range of urea?

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 normal range of urea in human blood?

Normal human blood should contain between 1.8 – 7.1 mmol/L [1]. In the United States only the nitrogen component of urea is measured (the blood urea nitrogen, i.e., BUN), which is roughly one-half of blood urea. The normal range for BUN is between 5 – 20 mg/dL [1]. To convert from mmol/L into mg/dL, divide by 0.357.

What are the limitations of urea as a renal function test?

The limitation of urea as a test of renal function is that in some circumstances plasma urea is not a sufficiently accurate reflection of GFR. For example, urea is an insensitive indicator of reduced GFR; GFR must be reduced by around 50 % before serum/plasma urea increases above the upper limit of the reference range [15].

What does it mean if my urea nitrogen level is high?

Ask your doctor to explain your results. Urea nitrogen levels tend to increase with age. Infants have lower levels than other people do, and the range in children varies. Generally, a high blood urea nitrogen level means your kidneys aren’t working well. But elevated blood urea nitrogen can also be due to:

What is the unit of plasma urea concentration?

In the US and a few other countries, plasma or serum urea concentration is expressed as the amount of urea nitrogen. Although plasma or serum is used for the analysis, the test is still, somewhat confusingly, commonly referred to as blood urea nitrogen (BUN), and the unit of BUN concentration is mg/dL.