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In medicine, the urea-to-creatinine ratio (UCR [1]), known in the United States as BUN-to-creatinine ratio, is the ratio of the blood levels of urea (mmol/L) and creatinine (Cr) (μmol/L). BUN only reflects the nitrogen content of urea (MW 28) and urea measurement reflects the whole of the molecule (MW 60), urea is just over twice BUN (60/28 ...
Measurements of urea and creatinine (Cr) in the blood are used to assess renal function. For historical reasons, the lab test measuring urea is known as "blood urea nitrogen" (BUN) in the US. The BUN:Cr ratio is a useful measure in determining the type of azotemia and will be discussed in each section below. A normal BUN:Cr is equal to 15. [3]
A reference range is usually defined as the set of values 95 percent of the normal population falls ... blood urea nitrogen: 7 [14] 18, [14 ... BUN/Creatinine Ratio ...
BUN-to-creatinine ratio (the ratio of blood urea nitrogen to ... at higher/normal values. ... than older methods when the serum creatinine values are relatively low ...
Creatinine levels in μmol/L can be converted to mg/dL by dividing them by 88.4. The 32788 number above is equal to 186×88.4 1.154. A more elaborate version of the MDRD equation also includes serum albumin and blood urea nitrogen (BUN) levels:
The normal range of GFR, adjusted for body surface area, is 100–130 average 125 (mL/min)/(1.73 m 2) in men and 90–120 (mL/min)/(1.73 m 2) in women younger than the age of 40. In children, GFR measured by inulin clearance is 110 (mL/min)/(1.73 m 2 ) until 2 years of age in both sexes, and then it progressively decreases.
A basic metabolic panel (BMP) is a blood test consisting of a set of seven or eight biochemical tests and is one of the most common lab tests ordered by health care providers.
Normal human adult blood should contain 7 to 18 mg/dL (0.388 to 1 mmol/L) of urea nitrogen. [1] Individual laboratories may have different reference ranges, as they may use different assays. [2] [3] [4] The test is used to detect kidney problems. It is not considered as reliable as creatinine or BUN-to-creatinine ratio blood studies. [1]
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